The site is a service of the U.S. Citizenship and Immigration Services (U.S. Citizenship and Immigration Services). The website is the official website of the U.S. Citizenship and Immigration Services (U.S. Citizenship and Immigration Services), providing information on the agency, immigration and citizenship matters. U.S. Citizenship and Immigration Services' primary mission is to ensure that the United States, as a nation of immigrants, provides accurate and useful information to immigrants, and its main tasks include granting immigration and citizenship benefits, helping to understand citizenship, and ensuring the integrity of the immigration system.