Adjustment of status is a process for certain immigrants already in the United States to become lawful permanent residents, or green card holders. It allows individuals to change their immigration status without having to return to their home country for visa processing. Through this process, eligible individuals can apply for a green card while remaining in the U.S., provided they meet specific requirements set by U.S. Citizenship and Immigration Services (USCIS). It's an important step toward obtaining permanent residency and enjoying the benefits of living and working in the United States legally.