Immigration law refers to a set of rules and regulations that govern the movement of people into and out of a country. These laws determine who can enter a country, how they can do so, and under what conditions they may remain or become citizens. Immigration law also addresses issues related to border control, visas, green cards, refugee status, asylum, deportation, and naturalization. The purpose of immigration law is to regulate the flow of people into a country while ensuring national security and public safety, protecting human rights, and promoting economic growth and development.