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What Is a Visa? A visa is a travel document that allows you to enter a foreign country for a specific period of time. In most cases, you have to apply for a visa before travelling, either at an embassy, consulate, or online. Sometimes you can also obtain a visa on arrival. Visas are usually affixed onto your passport and state how long you can stay. Most countries impose visa requirements for foreign nationals as a security measure: to keep track of who enters and to stop illegal immigration. Visas are also used as a defensive effort, stopping security risks from entering a country. A visa is a sticker on your passport, containing your name, picture, and the number of days you are allowed to stay in a specific country. In some cases, visas are also issued as separate documents and are not attached to your passport – such as electronic visas, which you must print out.