What is the difference between a single-entry and a multiple-entry visitor visa?

A single-entry visitor visa authorizes you to enter Canada one time. Once you leave, you generally cannot use it to return and would need a new visa, with some exceptions for short trips to the U.S. or St. Pierre and Miquelon.

A multiple-entry visa lets you travel to Canada as often as you want while the visa is valid, for as long as it remains valid and your passport is valid.

Multiple-entry visas are issued in most cases. You do not apply for a specific type; the officer decides which to issue based on your application.