Travel visa

A travel visa is a conditional authorization granted by a polity to a foreigner that allows them to enter, remain within, or leave its territory. Visas typically include limits on the duration of the foreigner's stay, areas within the country they may enter, the dates they may enter, the number of permitted visits, or if the individual can work in the country in question. Visas are associated with the request for permission to enter a territory and thus are, in most countries, distinct from actual formal permission for an alien to enter and remain in the country.

In each instance, a visa is subject to border control at the time of actual entry and can be revoked at any time.
Visa evidence most commonly takes the form of a sticker endorsed in the applicant's passport or other travel document but may also exist electronically.
Some countries no longer issue physical visa evidence, instead recording details only in border security databases.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain