A job offer is a genuine offer of employment from a legitimate Canadian employer.
Yes. Individuals may apply for a Temporary Work Permit on its own or in combination with an application for a Canada Immigration Visa. Immigration, Refugees and Citizenship Canada (IRCC, formerly CIC) recognizes the concept of "dual intent" whereby an applicant desires to work in Canada temporarily and thereafter reside and work in Canada permanent
As a general rule, the first step is to obtain a valid job offer from a Canadian employer. Open work permits are the exception and do not require a prior job offer. Open work permits may be available to the spouses/common law partners of certain work permit holders, the spouses/common law partners of foreign students in Canada, asylum seekers, in-land sponsored family members, and destitute students in Canada.