A permanent resident is an individual who has immigrated to Canada and has been granted a type of residency. They retain their citizenship to their original country but, just as Canadian citizens do, they benefit from:
A permanent resident is subject to paying taxes and Canadian law, the only difference being that they cannot vote, run for office, or hold certain government positions that offer high-level security clearance.
Canadian residency needs to be maintained, while citizenship doesn’t, only losing it if you so choose to renounce it.