Immigration policy: The rules and regulations set by a country regarding who can enter and reside within its borders. Immigration policies can vary based on factors such as economic needs, national security concerns, and humanitarian considerations.
Quota system: A numerical limit imposed by a government on the number of immigrants allowed into a country from specific regions or countries within a given time period.
Visa: An official document issued by a government that allows individuals to legally enter and stay in a foreign country for various purposes (such as travel, work, study) for a specified duration.