what are the meanings of different domain names

http://en.wikipedia.org/wiki/Domain_name...

A name used to identify your company or personal website on the internet. (e.g. yahoo.com, google.com, etc.)

The term domain name has multiple related meanings:

# A name that identifies a computer or computers on the internet. These names appear as a component of a Web site's URL, e.g. www.sitename.com. This type of domain name is also called a hostname.

# The product that Domain name registrars provide to their customers. These names are often called registered domain names.

# Names used for other purposes in the Domain Name System (DNS), for example the special name which follows the @ sign in an email address, or the Top-level domains like .com, or the names used by the Session Initiation Protocol (VoIP), or DomainKeys.

The most common types of domain names are hostnames that provide more memorable names to stand in for numeric IP addresses. They allow for any service to move to a different location in the topology of the Internet (or an intranet), which would then have a different IP address.

By allowing the use of unique alphabetical addresses instead of numeric ones, domain names allow Internet users to more easily find and communicate with web sites and other server-based services. The flexibility of the domain name system allows multiple IP addresses to be assigned to a single domain name, or multiple domain names to be assigned to a single IP address. This means that one server may have multiple roles (such as hosting multiple independent Web sites), or that one role can be spread among many servers. One IP address can also be assigned to several servers, as used in anycast and hijacked IP space.