Immigration control refers to the policies and practices that a country uses to manage the entry and stay of foreign nationals. This includes processes like visa applications, border checks, and the enforcement of laws regarding who can enter or remain in the country. The goal is to ensure national security, regulate the labor market, and maintain social order. Countries often have specific agencies, such as Customs and Border Protection in the United States, responsible for overseeing immigration control. These agencies assess applications, conduct background checks, and monitor compliance with immigration laws to prevent illegal entry and ensure that those who enter meet the necessary requirements.