The U.S. immigration system is a complex framework that governs how individuals from other countries can enter, live, and work in the United States. It includes various visa categories, such as family-sponsored visas, employment-based visas, and refugee admissions, each with specific eligibility requirements. The system is managed by agencies like U.S. Citizenship and Immigration Services (USCIS) and Customs and Border Protection (CBP). Individuals seeking to immigrate must often navigate a lengthy application process, which may involve interviews, background checks, and waiting periods. The system also addresses issues like deportation and asylum, reflecting the balance between national security and humanitarian concerns.