A squatter is a person who remains on the land of another without title, right, or payment of rent. It is often used to refer to a person who settles on public lands. Squatters are often found in poor countries, where lower income groups, incapable of finding a solution to their housing needs within the rules and standards set by society, proceed to solve it through their own resources and efforts.
In the context of the Internet, a squatter is a person who registers a domain name for a website solely for the intent of selling the rights to the domain name in the future to someone who has a legitimate connection to the name. They are often called "cybersquatters".