What are the components of a domain name?
Top level domains A domain name consists of two or more words separated by a period. The last word (the far right) is called a "top-level domain". Here are some common top-level domains and their use: .COM - Used for commercial entities. It is the most popular top-level domain. Anyone can register a .com domain. .NET - Originally used for networking organizations such as Internet Service Providers and backbone providers. Today, anyone can register a .net domain. .ORG - Designed for miscellaneous organizations, including non-profit groups. Today, anyone can register a .org domain.

Country Codes Two letter domains, such as .uk, .de and .jp, are called country code top level domains (ccTLDs) and correspond to a country, territory, or other geographic location. The rules and policies for registering domain names in the ccTLDs vary significantly and some are reserved for use by citizens of the corresponding country. You should check with the registrar offering ccTLD registration services regarding the specific terms and conditions for registration. Some Megawrite.com registered partners provide registration services in the ccTLDs in addition to registering names in .com, .net and .org; however, ICANN does not specifically accredit registrars to provide ccTLD registration services.

Second level domains To the left of the top-level domain is what is called the "second-level domain." In Megawrite.com, "Megawrite.com" represents a second-level domain within the top-level domain of .com. It is also possible to have a domain name in the form of something. Megawrite.com. In this case the "something" is called a "host" name or a "sub-domain". It is not necessary to register a host or sub-domain with a registrar before being able to use it