What is HTML? 
HTML is also known as HyperText Markup Language. 
HTML is a standard mark up language that is used to make webpages. 
All web pages on the world consists of HTML. 
In another word HTML is a language of the web pages. HTML is a language standardiSed for tagging text files into realise colour, graphic, font and hyperlink from WWW pages. 
The extension name of the html file is htm or html. 

Structure of HTML file. 
HTML file consists of tags.
the syntax of tag is presented 
<tagName> ...</tagName>