A citizen of any foreign country who wishes to travel or transit through a Canadian airport must first obtain a Temporary Resident Visa (TRV). It is an official document issued by a Canadian visa office that is placed in your passport to show that you have met the requirements for admission to Canada as a temporary resident for business, study, tourism or a combination of these. 

As a general rule, tourists are admitted for a period of six months. Temporary foreign workers and international students are admitted for varying periods of time, as determined on a case-by-case basis. There are several types of temporary resident visas such as: