Foreign nationals from certain countries who wish to visit Canada may need to apply for a visa to enter Canada. Others, however, may only need to apply for an Electronic Travel Authorization (ETA).
To enter and remain in Canada, foreign nationals must obtain an authorization or hold a valid travel document that allows them to remain in Canada for a specified period of time. However, it is possible to extend the period of stay authorized as a visitor. Depending on the case, several conditions must be met.