Immigration is the act of entering a country with the intention of permanently living and/or working there. U.S. immigration laws cover entry into the country for almost any purpose, including temporary stays beyond a certain length of time. U.S. Immigration law covers the procedures for entering the US, and determines who is and is not eligible for entry. It also sets the rules for obtaining citizenship and deporting foreign nationals who violate US immigration or other laws.
Immigration laws fall into two distinct categories such as enforcement, and benefits. Enforcement includes border control and security, removal of illegal aliens, and investigation and enforcement of other immigration laws, such as document fraud, alien smuggling, and work authorization. The other category of immigration laws has to do with benefits, such as asylum, naturalization, and admission to the U.S.