The U.S. Citizenship and Immigration Services (USCIS) is the main federal agency responsible for deciding on immigration applications. As an applicant, you can apply online or need to visit a location near you, depending on your form type and individual case.
The federal agency operates different types of offices, including application centers, asylum centers, field offices, etc. A field office is where you go for your immigration interview. Besides the interview, the offices also provide general information and case-specific guidance. However, with USCIS, the main source of information is the agency’s official website.