A IP adress is a unique string of numbers separated by periods that identifies each computer using the Internet Protocol to communicate over a network. A subnet mask is used to divide an IP address into twoparts. One part identifies the host, the other part identifiesthe network to which it belongs. To better understand how IP addresses andsubnet masks work, look at an IP address and see howit is organized. A domain name is the part of a network address that identifies it as belonging to a particular domain.Domain Name service is mechanism to translate IP address to domain and vice versa. HTML stands for Hypertext Markup Language, a standardized system for tagging text files to achieve font, color, graphic, and hyperlink effects on World Wide Web pages.The default page of a website id called the index page. The tag defines an image in an HTML page.