An "alien" or "foreigner" refers to a person who is not a citizen of the country in which they are currently residing. This term is often used in legal contexts to describe individuals who may have different rights and responsibilities compared to citizens. Aliens can include tourists, expatriates, and immigrants. In many countries, laws regulate the status and treatment of aliens, including visa requirements and residency permits. The term can also apply to individuals from different cultural or ethnic backgrounds, highlighting the diversity within societies. Understanding the status of aliens is important for discussions about immigration and international relations.