Extensions are categories of Internet domain names. There are several of them to choose from, presented here in order of popularity:
.com stands for commercial and is the most widely used extension in the world. Most businesses prefer a .com domain name because it reflects their business presence on the Internet. However, the .com extension, in the early days, was one of the few available, so many nonbusiness sites have a .com in their url.
.net stands for network. Internet service providers use this extension as do web hosting companies and other businesses directly involved in the Internet. Some businesses choose .net domain names for their intranet websites.
.org stands for organization. This extension is popular with nonprofit groups, schools and trade associations.
.biz—small business websites often choose this business extension.
.info signifies a website that offers “information.” It’s the most popular extension after .com, .net and .org.
.us is for United States websites. .cc was originally the country code for Coco’s Keeling Islands. It is unrestricted, and anyone, from any country, can register a name with this extension.
.tv designates rich content/multimedia websites. Media and entertainment sites commonly use this extension
.name is the only domain extension specifically designed for personal use. It is suited to people who want easy-to-remember e-mail addresses and personal websites.
.co.uk indicates a commercial domain name (similar to a standard .com extension) in the United Kingdom. It is unrestricted, and anyone, from any country, can register a name with this extension