HTML is Markup Language,it's full form is "Hypertext Markup Language".It is used for creating basic structure of a webpage.

HTML is called "Markup Language" because the code written in Angular Bracket"<>"

The extension of HTML page is".html,.htm"

There are Following six types of heading in HTML:

1. h1
2. h2
3. h3
4. h4
5. h5
6. h6