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Now, first of all,

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let's clarify what

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exactly third party packages are.

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I did briefly mention

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what I mean by that

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and why they might be helpful.

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But let's take a closer look.

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And I want to take

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a closer look by first of all,

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emphasizing that you can write all

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the CSS and JavaScript code

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that your project might need

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on your own.

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You don't need third party packages at all.

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You can write everything on your own.

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But often as I mentioned,

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you will have certain features

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or styles or tasks that you

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basically write over and over again,

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across multiple projects.

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And it's not just you,

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as I mentioned,

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that's the case for all developers.

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There are certain features,

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a certain elements,

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which we find on almost any website out there,

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maybe just with tiny adjustments.

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And if every developer has

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to write that feature from the

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ground up, over and over again,

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that's a lot of wasted time

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and also error prone.

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That could be certain default styling

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or arrangements of elements

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on your page that

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is repeated over and over again.

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That could be a feature

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like an Image Carousel,

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where you can click through multiple images

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and have a slideshow of images.

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And that could also be something

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like a parallax effect,

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which is a certain kind

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of visual effect,

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which you can get when you

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scroll on that page.

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And we are going to have

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a look at these examples and other

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examples from this course section.

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So, we have things like

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that which might be repeating across pages.

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And therefore,

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we often don't want

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to write that code on our own,

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but instead we might want

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to utilize third party packages

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written by others

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or maybe even written by us,

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but then stored in a package

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and maybe distributed to the

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web, so that others could use it.

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And we then can use such packages no matter

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if we wrote them, or others wrote them

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to include them into our project,

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into our website,

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and then build up

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on those packages

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and use those pre-built features

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without writing all the code

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for that on our own.

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Now we have popular packages,

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third-party packages

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for both CSS and JavaScript.

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And let's maybe start with

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some CSS examples.

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Though, I will say that these

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are really just examples.

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There is an endless amount

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of packages out there solving

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different problems.

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And as always in life,

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Google will be your friend.

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Once you've got a bit

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more experience

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to find the specific

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packages that you might need

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for your projects.

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Now popular CSS packages,

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which you see being used

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in a lot of projects would

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for example, be Bootstrap,

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Material UI,

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or Tailwind CSS.

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And these are all so-called CSS

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frameworks and framework

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is just a fancy term,

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which we can basically use

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as an equivalent to package for now.

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That ship with a lot

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of built in features in this case,

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since they are CSS packages

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with a lot of built in styles,

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a lot of built in CSS classes

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to be precise,

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which we can sprinkle

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on our HTML elements

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to get certain looks and stylings

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and layout structures without having

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to write our own CSS code.

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And that can of course be

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a strong reason for using such

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a third-party CSS package.

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Since we can save all that time,

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which we would otherwise spend

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on writing our own CSS code.

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Now, again, I'll come back

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to these packages in a second,

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and we're going

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to see some CSS package code

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in action soon.

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But first of all,

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let's also have a look at JavaScript.

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Now for JavaScript,

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though,

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it is worth highlighting that,

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unlike with CSS,

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we don't always include

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big JavaScript packages,

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which then gave us tons

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of functionalities all in one package.

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Even though such packages also exist.

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But instead we also often

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just use smaller packages,

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which each only solve one specific problem.

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Since unlike with CSS where you

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typically want to have

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the same style for everything on your page

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and therefore for you need

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a lot of built in styles.

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With JavaScript you often just want

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to solve small tiny specific problems.

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And for example,

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you might want to add

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an Image Carousel,

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where you can move

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through a gallery of images

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and well, since something

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is changing on

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the loaded page here,

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we know that JavaScript

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has to be involved

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and that could be

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some JavaScript code

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which we don't want to write

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on our own,

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since it can become more complex,

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if your carousel is more complex

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and hence we might want

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to bring a third party package for that.

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That gives us such an

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image gallery feature built in.

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Or we might want

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to use a JavaScript package

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that gives us a Scrollspy.

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Which basically is a feature

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where we scroll through some content

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and we might have

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some outline maybe

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on the right or left of that content

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and then different sections,

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different links in that outline

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are highlighted as we

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we reach those sections

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in the scrollable content.

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Or maybe we want that parallax effect,

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which I mentioned and showed before,

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where we have that scrolling effect

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that animated scrolling effect,

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which turns out

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is also driven by JavaScript.

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And you could implement

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all these features

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with your own JavaScript code.

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But since the code

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for that can become complex,

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and since these are features,

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which you will often see

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on different websites,

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you might just want

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to use an existing solution

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and not waste time writing

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your own code for that.