A visa is an authority issued by the Embassy/Consulate of a country that permits a traveler to visit that particular country. The majority of visas are stamped inside your passport. (A small number of visas are either separate documents to be carried with the passport or issued electronically.) Visas are issued with specific limitations regarding purpose of visit, length of stay, validity of visa, etc? It is the traveler’s responsibility to obtain necessary visas for their travel itinerary.