Every year millions of people visit Canada, many of which require a Temporary Resident Visa ("TRV"). This is also commonly referred to as a visitor or tourist visa. If you are from a country that requires a temporary resident visa to enter Canada as a visitor, you must apply for that TRV at the Canadian visa office responsible for your country or region before coming to Canada. A visa officer will review your TRV application and decide whether to issue a visa.
There are two types of TRV's: a single entry visa and a multiple entry visa. Both are valid for a fixed period and cannot be used after they expire.
A single entry visa allows you to come to Canada only one time. Once you have left Canada, excluding travel to the United States and St. Pierre and Miquelon, you will need a new visa to travel back to and enter Canada.
A multiple entry visa allows visitors to come and go from Canada for six months at a time, without having to reapply each time. It can be valid for up to 10 years, or one month before your passport expires, whichever is earlier. You must arrive in Canada on or before the expiry date on your visa.
If you want to extend your visit in Canada, you must apply to do so. Check your temporary resident visa to make sure you apply before the expiry date. You should apply 30 days before your status expires.