A visa is a document necessary for international travel, which is issued by a national government to a foreign citizen or resident for legal proof of entry into the country's territory. Types of visas include tourist visas, work visas, student visas, etc. The process and requirements for applying for a visa vary from country to country, and generally require the provision of a valid passport, visa application form, photographs, and other documents, as well as payment of a visa fee. The process of applying for a visa requires patience and care. If a visa is denied, it will affect travel plans and living arrangements, so it is important to read the country's visa guidelines and regulations carefully before applying for a visa to ensure a successful application.