People who would not normally be eligible to become permanent residents of Canada might be able to apply on humanitarian and compassionate groundsHumanitarian and compassionate grounds apply to people with exceptional cases. These applications are assessed on a case-by-case basis.
Express Entry is an online system created in 2015 for Canadian immigration, having become the most popular route for those dreaming of immigrating to Canada (except Quebec). It works like a points system used by the government to select immigration through faster processing (on average 6 months) through 3 different programs. See here the comparative table between them.
Immigration program for foreign workers who have at least 1 year of qualified professional experience in Canada (in NOC’S 0, A or B roles) in the last 3 years before applying, either full-time or the equivalent in hours as part-time , but always with worker status (work experience with student and cooperative status does not count).