A foreign travel document is a document that is required for international travel. The most common type of foreign travel document is a VISA, which is an official document issued by a country's government that allows a person to enter, remain in, or leave the country. A VISA is typically a four-letter code that is stamped or attached to a passport. It is important to obtain the correct VISA for the country you are travelling to, as it can affect your ability to enter and remain in the country.