Aliens, in the context of immigration, refer to individuals who are not citizens of the country they are residing in. They may come from different countries for various reasons, such as seeking better job opportunities, escaping conflict, or reuniting with family. The legal status of these individuals can vary, with some being documented and others undocumented. Immigrants often contribute to the economy and culture of their new country. They may bring diverse skills, traditions, and perspectives, enriching the local community. Governments typically have specific laws and processes in place to manage the entry and residency of aliens within their borders.