Mortgage Real Estate Investment Trust (mREIT) is a type of real estate investment trust (REIT) that specializes in investing in mortgage-backed securities (MBS). mREITs are publicly traded companies that use the capital they raise from investors to purchase and manage a portfolio of mortgage-backed securities. These securities are backed by residential and commercial mortgages, and the income generated from them is used to pay dividends to shareholders. mREITs are a popular investment vehicle for those looking for a steady stream of income, as they typically pay higher dividends than other REITs.