HTML use HTML tags to assign properties to the content. HTML with it's tags play a important role in web development. Learn full html tutorial from the scratch. An HTML tag is a keyword surrounded by the sign '<>'. All these tags has a special meaning to web browser. Each tag's work is predefined and the content we write or insert between these tags will be displayed on the web page as per the definition of that tag. For example: This is a paragraph , this line will display a paragraph because the content we write between tags get displayed as a paragraph in the browser.