HTML stands for Hyper Text Markup Language
HTML describes the structure of Web pages using markup
HTML elements are the building blocks of HTML pages
HTML elements are represented by tags
HTML tags label pieces of content such as "heading", "paragraph", "table", and so on
Browsers do not display the HTML tags, but use them to render the content of the page


<!DOCTYPE html>
<title>Page Title</title>
<h1>My First Heading</h1>
<p>My first paragraph.</p>

Taken from w3 schools