Commercial mortgage-backed securities (CMBS) are fixed-income investment products that are backed by mortgages on commercial properties rather than residential real estate. CMBS can provide liquidity to real estate investors and commercial lenders alike.

Residential mortgage-backed securities (RMBS) are debt-based assets backed by the interest paid on residential loans. Mortgages and home-equity loans have a comparatively low rate of default and a high rate of interest since there is a high demand for the ownership of a personal or family residence. Investor risk is mitigated by pooling many of these loans to minimize the risk of default.

A collateralized mortgage obligation (CMO) refers to a type of mortgage-backed security that contains a pool of mortgages bundled together and sold as an investment. Organized by maturity and level of risk, CMOs receive cash flows as borrowers repay the mortgages that act as collateral on these securities. In turn, CMOs distribute principal and interest payments to their investors based on predetermined rules and agreements.