The Canada Pension Plan (CPP) is a contributory, earnings-related social insurance program. It forms one of the two major components of Canada's public retirement income system, the other component being Old Age Security (OAS). Other parts of Canada's retirement system are private pensions, either employer-sponsored or from tax-deferred individual savings (known in Canada as a Registered Retirement Savings Plan). [http://www.hrsdc.gc.ca/en/isp/common/hrsdc/ris/rismain.shtml] - Source: Wikipedia