If you like to reunite with your family members, come to visit Canada as a tourist or you are a business visitor you can apply for Visitor Visa. IF you apply for Visitor Visa from outside of Canada, depends on nationality of your passport you either need a Temporary Resident Visa (TRV) or Electronic Travel Authorization (eTA). You may also need to transit through Canada on your way to another country. The document you need to transit through Canada depends on how you will travel through Canada, how long it’ll take you to transit through Canada, the nationality of your passport and other factor.