Residential mortgage-backed security are a type of mortgage-backed security backed by residential real estate mortgages.
Bonds securitizing mortgages are usually treated as a separate class, making reference to the general package of financial agreements that typically represents cash yields that are paid to investors and that are supported by cash payments received from homeowners who pay interest and principal according to terms agreed to with their lenders; it is a funding instrument created by the "originator" or "sponsor" of the mortgage loan; without cross-collateralizing individual loans and mortgages, it is a funding instrument that pools the cash flow received from individuals and pays these cash receipts out with waterfall priorities that enable investors to become comfortable with the certainty of receipt of cash at any point in time. From Wikipedia
