Illegal migration refers to the act of individuals moving to a country without the necessary legal permissions or documentation. This can include crossing borders without authorization or overstaying a visa. People may engage in illegal migration for various reasons, such as seeking better economic opportunities, escaping conflict, or reuniting with family members. Governments often implement laws and policies to manage illegal migration, which can lead to debates about border security, human rights, and the impact on local communities. Organizations like the United Nations and various non-governmental organizations work to address the challenges and humanitarian aspects associated with illegal migration.