In each instance, a visa is subject to entry permission by an immigration official at the time of actual entry, and can be revoked at any time. 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.
Visas typically may 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 an individual's right to work in the country in question. A visa (from the Latin charta visa, meaning 'paper that has to be seen') is a conditional authorization granted by a territory to a foreigner, allowing them to enter, remain within, or to leave that territory.
