An "illegal immigrant" refers to a person who enters or resides in a country without the legal permission required by that country's laws. This can happen when individuals cross borders without proper documentation or overstay their visas. Illegal immigration is a complex issue that affects many nations around the world. Countries often have specific laws and regulations regarding immigration, and those who do not comply may face legal consequences. The term is often associated with debates about border security, human rights, and the economic impact of immigration on society and labor markets.