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US Visa is an official document that allows foreign nationals to enter the United States for various purposes, such as tourism, business, or study. There are several types of US Visas, including visitor visas (B1/B2), student visas (F1), and work visas (H1B). Each visa type has specific requirements and eligibility criteria. Applying for a US Visa typically involves submitting an online application, attending an interview, and providing necessary documents to support your request.