Undocumented immigrants are individuals who enter or reside in a country without legal permission. This can happen through various means, such as overstaying a visa or crossing borders without authorization. They often seek better economic opportunities, safety, or family reunification. In many countries, including the United States, undocumented immigrants may face challenges such as limited access to healthcare, education, and legal employment. Their status can lead to fear of deportation and difficulties in integrating into society, despite their contributions to the economy and community.