A domain is a user-friendly naming system that allows people to easily navigate web servers and web pages. Rather than making people type in an IP address whenever they want to access a certain web page (like 188.8.131.52), websites are instead assigned easy-to-remember character strings, called domains.
Some of the most common domain extensions you’ll see are: .com – The most popular TLD around, this was originally designed for commercial businesses, but can now be used by any individual or organization on the Internet. .biz – Designed for use by businesses. .org – Most commonly used by nonprofit organizations, this domain extension has since grown to be nearly as ubiquitous as .com. Anyone can register a .org domain name. .net – Like a lot of TLDs, this one was intended for use by networks (think Cox Cable), but can now be used and registered by anyone. .gov – Unlike the domain extensions above, the .gov TLD continues to be restricted, meaning only government organizations are permitted to use it. .mobi – Oftentimes a company or organization registers their domain name using .mobi if they’re showing a mobile-only version of their website. .ng (or other country specific domains) – You’re likely to only see ccTLDs that match your home country. These are restricted, and may only be registered by a company or organization that resides within the same country. For example, only NG companies may register a .ng domain name.