A Work permit in Canada is required for most jobs in Canada.  There are
some exceptions when it comes to business people, investors,
multinational companies, and countries with Canadian Trade Agreements.
In most of the cases, there are four ways to apply for a Canadian Work Permit:

1. Co-op Work Permit/Internship work permit. If your school has a Co-
   op program and you need to complete a paid internship course to graduate, you can
   apply for an internship work permit. 
2. Open Work Permit for Spouse or Common-law partner. If your spouse is a
   student visa holder (study in a public school or private schools have DIL number and a
   degree program), you can also apply for Work Permit. If your spouse is on a work
   permit and is in an OAB position, you can also apply for a work permit.
3. Bridging Open Work Permit. If you have already obtained federal first stage
   approval and your work permit expires within four months, you can renew your work
   permit for another year.
4. Post-Graduates Work Permit. Graduate work permit. Public school Diploma
   graduates, private school Associate-Degree graduates, courses of more than certain
   period can apply for a work permit. You can get a three-year work permit for courses of
   more than two years, and you can apply without an employer’s guarantee.