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HTML
What it is
HTML, or HyperText Markup Language, is a markup language that describes the contents of a website. Unlike CSS and Javascript, which respecitvely define the appearance and behavior of a site, HTML’s job is to define its semantic structure. If CSS is the skin and javascript is the brain, HTML is the bones.
It is composed of a series of nested tags that define the elements of the page, such as headers, paragraphs, buttons, lists, etc.
<!DOCTYPE html>
<html>
<body>
<h1>Basic HTML Page</h1>
<p>This is a paragraph.</p>
</body>
</html>
Why it matters
Every webpage uses HTML. If you want to work on anything related to the web, you need to grasp HTML.
Related guides
How to learn it
Take a look at the HTML lesson in the Developer Atlas Making Websites curriculum.