If you are planning a trip to Canada, there is a new document that International travelers need to acquire before they come to Canada.
This new entry requirement is now in effect: visa-exempt foreign nationals need an Electronic Travel Authorization (eTA) to fly to or transit through Canada. Exceptions include U.S. citizens, and travelers with a valid Canadian visa. Canadian citizens, including dual citizens, and Canadian permanent residents cannot apply for an eTA.
Visit this link and check if you need to acquire this new eTA document before you come to Canada. http://www.cic.gc.ca/english/visit/visas.asp