An example of a complete web address is as follows: //www.example.com 。 The domain name corresponding to this website is example.com. People create a host that provides WWW information and name it with a domain name. At this time, the host name is called www. domain name. When a visitor wants to access this host, the browser will send a data request to the host with the specified http (Hypertext Transfer Protocol) protocol. For this reason, we will add the prefix //when describing a complete website.