Electronic Travel Authorization
Briefly, U.S. citizens and travellers with a valid Canadian visa, as well as, Canadian citizens, including dual citizens, and Canadian permanent residents cannot apply for an eTA. Further, visa-exempt travellers do not need an eTA when entering Canada by land (e.g. car or bus) or sea (e.g. cruise ship).
An eTA can be valid for up to 5 years or until your passport expires. For example, if you get a new passport, you will need to get a new eTA. With a valid eTA you can travel to Canada as often as you want for short stays (normally for up to 6 months at a time).
Make sure you don’t get scammed!
If you need an eTA, go to Canada.ca/eTA to apply. It is the only official Government of Canada website to apply for an eTA. Applying for an eTA is a simple and inexpensive online process. In summary, all you need is: $7 CAD, your passport and an email address. For more information visit IRCC.