PNPs (Provincial Nominee Programs) as the name suggests are the immigration programs, which allow the different provinces across Canada to select the immigrants, appropriate for its labour market and economy. The Candidate who wishes to immigrate to and settle in a specific province of Canada can apply in the respective PNP programs.
Every province selects provinces based on its own needs, criteria and parameters and hence each province has a different set of requirements as well. The Quebec Province is not enrolled in PNP programs as it has its own selection criteria and system to select immigrants for its region. Each province has a contract with IRCC (Immigration Citizenship Refugee Canada) that permits them to choose permanent residents for their own province.