Work Permit

(http://www.cic.gc.ca/english/work/apply-who-nopermit.asp)

A document issued by IRCC that authorizes a person to work legally in Canada. It sets out conditions for the worker such as the type of work they can do, the employer they can work for, where they can work, and how long they can work.

Post-Graduation Work Permit

Post-graduation work permit is a special type of work permit that IRCC issues to eligible foreign students who have graduated from an approved program of study at an eligible post-secondary institution in Canada that is participating in the Post-Graduation work permit program and applied to CIC within 90 days of completing all degree or program requirements. It allows the bearer to work legally in Canada after completing studies.

(http://www.cic.gc.ca/english/study/work-postgrad.asp)