The full form of .NET is Network

The domain name net is a generic top-level domain (gTLD) used in the Domain Name System of the Internet. The name is derived from the word network, indicating it was originally intended for organizations involved in networking technologies, such as Internet service providers and other infrastructure companies. However, there are no official restrictions and the domain is now a general-purpose namespace. It is still popular with network operators and the advertising sector, and it is often treated as an alternative to com.

A .net domain name still retains value, being one of the most valuable domain extensions in the aftermarket. Today, there are approximately 15 million registered .net domain names, and is the second most popular TLD after .com.