A Real Estate Investment Trust (REIT) is a company that owns, operates, or finances income-generating real estate. They make it possible for individual investors to earn dividends from real estate, without having to buy, manage, or finance any properties, by pooling the capital of numerous investors.
CAPREIT is the largest REIT in Canada.
ACORN is forming a national CAPREIT Tenant Union. If you want more info on REITS and CAPREIT specifically you can read up here:
https://acorncanada.org/resource/acorn-capreit-tenant-union-platform
https://www.investopedia.com/terms/r/reit.asp