HTML stands for Hyper Text Markup Language. HTML is the language, which is understood by web browsers.
HTML used to show and layout contents on web page. HTML comprises on set of markup tags.
No matter which technology we use for server side programming (asp.net, Php, Jsp…) but all server side code is converted, rendered to client side code (HTML) as web browsers understands only client side code.
HTML files are recognized by .htm or .html
for more details……….