Every Permanent Resident in Canada has a PR Card that is issued by the Citizenship and Immigration Canada (CIC). It is utilized as a legitimate identity proof for citizens who fly out of the country or abroad and come back often. It is highly imperative or compulsory to have a legitimate PR card to make sure you are permitted to enter Canada.
On the most, a PR Card is valid for five years and needs to be carried whenever you are moving out or coming back to the country. An expired PR Card should be renewed to keep you going outside of Canada without any hassles.