To visit Canada, you will need a visa in the category of TRV (Temporary Resident Visa) that allows you to live in Canada for up to 6 months. A Canada Visitor visa (also known as a Tourist visa) or eTA is a TRV.
The Canada Visitor visa is meant for you to arrive in Canada for purposes of tourism or visiting friends and relatives living in Canada. With this visa, you can travel throughout Canada as long as the visa is valid.
ETA is applicable to those who arrive in Canada by air. Travelers taking other modes of transport will need to contact the Canadian consulate and check if they can apply for an eTA or go for a regular Canada Visitor visa.
The eTA is automatically attached to your passport. In case you have dependents coming with you, each of them will have to apply for an eTA. If your eTA application is approved, you only need to carry your passport while traveling to Canada.
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