a - href

<a href="URL">

Possible values for URL:

• An absolute URL - points to another web site. (like href="http://www.example.com/default.htm")
• A relative URL - points to a file within a web site. (like href="default.htm")
• Link to an element with a specified id within the page - (like href="#section2")
• Other protocols - (like https://, ftp://, mailto:, tel:, sms:, file:, etc..)
• A script - (like href="javascript:alert('Hello');")