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Now, I did already mention

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what NodeJS is and why we need a server-side language

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like NodeJS in the previous course section.

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Therefore, I only briefly want to summarize it here again,

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NodeJS is a language or to be very precise,

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a JavaScript Runtime that we can install on any computer.

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It allows us to execute JavaScript code

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outside of the browser.

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And up to this point in the course,

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if we ignored the previous course section,

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we only knew that browsers are able

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to execute JavaScript code.

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Well, it turns out that if we installed

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this extra NodeJS tool,

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any computer can execute JavaScript code.

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And therefore, we can use JavaScript

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in conjunction with this NodeJS

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runtime tool to write code that executes

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on a server since any computer can be a server.

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And that allows us to write server-side code

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that will for example, generate HTML instructions

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dynamically, or reach out to a file system

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or a database with JavaScript and NodeJS.

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Now I do have a complete deep dive course about NodeJS

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in case you want to learn more,

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but in this and the next course sections,

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we got many sections on this actually.

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You will learn how to use NodeJS,

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and how you can write such Backend code with NodeJS.

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Now, in order to write NodeJS code and write

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server-side JavaScripted Backend code with NodeJS,

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you first of all, need to install NodeJS.

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And for this, you should visit NodeJs.org.

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Here you'll find download links for the latest version

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and the long-term stability version.

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The difference between these two versions is that the LTS,

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the long-term support version simply is an older version,

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which still receives active support like security fixes.

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Whereas that latest version is well,

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as the name implies the very latest version

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with all the latest new features.

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As sometimes new versions introduce

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new features or break old features.

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That's why we have both a stable older version,

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and the latest version to choose from.

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Overall, it is worth noting though that NodeJS

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is a very stable and well-maintained runtime.

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And therefore you can download and use

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the latest version here for this course.

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Even if you see a different higher version number

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at the point of time you're viewing this video.

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What you will learn in this and the next course sections

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will still apply to that version.

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So you're not missing anything just because

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I'm using this version in this course right now.

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All that being said,

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you can now download this current, this latest version here.

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And by default, it should already select

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the version for your operating system.

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If it doesn't do that,

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you can click on other downloads,

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and here you'll find a Windows installer, a macOS installer.

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And you'll also find Binaries for Linux

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which you can download and use.

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But by default, the correct one should be preselected here.

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Now, if I do download this,

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it starts to download and downloads this installer

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on my system.

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And that's the case, both for macOS and Windows.

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Once the download finished, we can execute this installer.

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And here you see the macOS installer that started up,

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and you can just walk through all the steps

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that are shown here,

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and it's the same for windows.

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So here I'll continue, accept the license agreement,

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and basically accept all the default settings.

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Enter my password if prompted for,

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and install NodeJS with that.

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And as mentioned, it's the same on Windows.

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You also can just accept all the default settings here

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and then finish installation and close the installer

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once you're done.

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With that, we got the NodeJS tool installed on our system,

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and we can now use that tool to execute JavaScript code

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that may then also use extra NodeJS features,

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since NodeJS is the tool executing the code.

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Instead of the browser,

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we can use any JavaScript features

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that are supported by NodeJS.

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Now, which features are supported?

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That's something which you can find

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in the official Docs here on NodeJS.org.

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There, you can choose your NodeJS version.

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By default the latest one,

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and then click on API reference documentation.

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And you will learn about all the different parts,

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all the different packages you could say,

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that make up the NodeJS tool.

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And these are simply different packages that expose

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different features that you can use in your JavaScript code.

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Adjust as we can interact with the Dom in the browser.

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We now, for example,

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can interact with the file system here

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when executing our code with NodeJS.

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Now of course,

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going through these stocks can be very overwhelming,

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especially if you're just getting started,

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and they offer these Docs are a great backup,

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something to come back to,

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but we will learn NodeJS step-by-step together

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over the next lectures and course sections,

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because there are many important features to explore,

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many features and patterns

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which you are going to use over and over again.

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And that's there for what we are going

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to dive in throughout this course.