what is href in anchor tag code example

Example 1: email anchor tag

<a href="mailto:[email protected]">Email</a>

Example 2: anchor tag

The HTML <a> element (or anchor element), with its href attribute, 
creates a hyperlink to web pages, files, email addresses, locations
in the same page, or anything else a URL can address. Content within
each <a> should indicate the link's destination.

Use:

<a href="https://example.com"> </a>