A visa for travel is an official authorization granted by a country that allows a foreigner to enter, stay within, or leave that country's territory for a specified purpose and period of time. It is usually a stamp or sticker placed in the traveler's passport or recorded electronically, indicating permission to seek entry at a border or port of entry. The visa outlines conditions such as the duration of stay, areas allowed to visit, number of visits permitted, and whether the traveler can work in the country

. Having a visa does not guarantee entry but shows that a consular officer has determined the traveler is eligible to request entry for the visa's stated purpose. Final admission is decided by border officials upon arrival

. Visas are typically required for foreign citizens traveling to many countries, including the United States, where different visa types correspond to the travel purpose, such as tourism, business, work, or study

. In summary, a visa is a permission document issued by the destination country that allows a traveler to legally enter and remain there temporarily under specific conditions