A mortgage-backed Pass-Through Certificate (PTC) is a specialized financial security representing an undivided ownership interest in a structured pool of residential or commercial mortgages. When a lending institution originates numerous individual mortgages, it pools them together and transfers them to a special purpose vehicle or trust that issues these certificates. Investors holding mortgage-backed PTCs receive scheduled monthly or periodic distributions consisting of proportional shares of principal and interest payments collected from the underlying homeowners, effectively passing the cash flows directly through the trust while distributing credit risks across broader capital markets.