On what basis can mortgage bonds be divided into real estate mortgage bonds, chattel mortgage bonds and trust mortgage bonds?

Mortgage bonds can be divided into real estate mortgage bonds, movable property mortgage bonds and trust mortgage bonds according to different collateral. Mortgagebonds refer to the fact that when the bond issuer issues bonds, it takes part of the bond issuer's property as collateral through due legal procedures, and once the bond issuer has debt repayment difficulties, it sells this part of the property to pay off the debts. Real estate mortgage bonds refer to guarantee bonds issued with real estate such as houses as collateral. It is a bond issued with real estate (such as houses and land) as collateral, and it is a kind of mortgage securities. Movable property mortgage company bonds are corporate bonds issued by joint-stock companies on behalf of credit or trust departments such as mortgage banks after machinery and equipment, automobiles, airplanes and other movable property are mortgaged. Mortgage trust bonds are usually entrusted to the trustee for safekeeping. When the company fails to pay off its debts on time, the trustee will handle the mortgaged securities and pay off its debts on its behalf, and mortgage the trust bonds to protect the legitimate interests of creditors. The collateral above is different.