[wikipedia] used either by purchasers of real property to raise funds to buy real estate; or alternatively by existing property owners to raise funds for any purpose, while putting a lien on the property being mortgaged
[dictionary] the proportion of a loan that is charged as interest to the borrower, typically expressed as an annual percentage of the loan outstanding.
[mtgprofessor] how many years the borrower has to repay the mortgage
Adjustable Rate Mortgage
[investopedia] An adjustable-rate mortgage is a type of mortgage in which the interest rate applied on the outstanding balance varies throughout the life of the loan
Fixed Rate Mortgage
[bankrate] A mortgage in which the interest rate does not change throughout the term