Federal skilled immigration
The economic categories are for applicants who have specific occupational skills and experience that meet the needs of Canada’s labor market and who will contribute to the Canadian economy. This includes management, professional, and technical occupations and skilled trades.
Skilled workers, who wish to immigrate to Canada are chosen and awarded PR based on their education, work experience, knowledge of English or French, and other factors.
Each program has its own minimum requirements, while for pilots it is usually enough to meet the minimum, for Express Entry the candidates are scored points and only the best of the best are chosen.
For more information please refer to https://www.cic.gc.ca/english/helpcentre/answer.asp?qnum=010&top=4
Mostly, the federal skilled immigration is being assessed and processed through Express Entry System, however, there are few pilots, which allow immigrating through provinces. You may find the information below: