Most foreign nationals require a work permit to work in Canada. A closed work permit allows you to work for a specific employer, while an open work permit allows you to work for any eligible employer listed in Canada. You can apply for a work permit from outside Canada as well as from within Canada, and eligibility requirements vary according to each situation. If you are applying from outside Canada, you will receive a letter of introduction at the port of entry and, after verification of this letter, your work permit will be issued at the port of entry on the day of your arrival in Canada.