Immigration law refers to the set of rules and regulations that govern how individuals can enter, stay, and leave a country. These laws determine who is eligible for visas, residency, and citizenship, as well as the rights and responsibilities of immigrants. Countries have different immigration laws, which can include processes for applying for asylum, family reunification, and work permits. Enforcement of these laws is typically managed by government agencies, such as the Department of Homeland Security in the United States, ensuring that immigration policies are followed and upheld.