Extensions are categories of Internet domain names. There are several of them to choose from:

• .com represents the word "commercial," and is the most widely used extension in the world. Most businesses prefer a .com domain name because it is a highly recognized symbol for having a business presence on the Internet.

• .net represents the word "network," and is most commonly used by Internet service providers, Web-hosting companies or other businesses that are directly involved in the infrastructure of the Internet. Additionally, some businesses choose domain names with a .net extension for their intranet Websites.

• .org represents the word "organization," and is primarily used by non-profits groups or trade associations.

• .biz is used for small business Web sites.

• .info is for credible resource Web sites and signifies a "resource" web site. It's the most popular extension beyond .com, .net and .org.

• .us is for American Web sites and is the newest extension. It has the largest amount of available names in inventory.

• .cc was originally the country code for Coco's Keeling Islands. It is unrestricted and may be registered by anyone, from any country.

• .bz was originally designated as the country code for Belize, but is now commonly used by small business who can't get the name they want using the .biz extension. It is unrestricted and may be registered by anyone, from any country.

• .ca is for Canada

• .ws is for West Samoa

• .to is for the island country Kingdom of Tonga

• .fm is for Federal State of Micronesia

• .tv is for the island country Tuvalu.

Click here for complete list of domain name extensions. More list of domain name extensions are found at http://www.internic.net/faqs/new-tlds.html and http://www.domainit.com/country-domains.htm