The U.S. Visa System is a framework that allows foreign nationals to enter the United States for various purposes, such as tourism, work, or study. There are two main types of visas: non-immigrant visas for temporary stays and immigrant visas for those seeking permanent residency. Each visa category has specific requirements and application processes. To obtain a visa, applicants typically need to fill out a form, pay a fee, and attend an interview at a U.S. embassy or consulate. The decision to grant a visa is based on factors like the applicant's purpose of travel, ties to their home country, and overall eligibility.