Effective March 15, 2016, travelers going to Canada need Electronic Travel Authorization (eTA) to visit the country.
The new requirement for eTA affects citizens of many countries that can visit in Canada without a visa (e.g. EU citizens).
Citizens of countries that needed visa before, will still need to apply for a visa.
U.S. citizens do NOT need eTA or visa to visit in Canada.

The eTA cost $7 Canadian dollars and can be obtained online on: canada.ca/eta
To apply, you will need a valid passport and credit card.
The application process may take about 15 minutes to complete and usually about one hour to get approved by CIC.
Approved eTA is valid for up to 5 years or until the passport you applied with is expired (whichever comes first).
eTA allows a stay of up to 90 days each year.