A mortgage is a type of loan used to purchase or maintain a home, land, or other types of real estate. The borrower agrees to pay the lender over time, typically in a series of regular payments that are divided into principal and interest. The property then serves as collateral to secure the loan. Individuals and businesses use mortgages to buy real estate without paying the entire purchase price up front. The borrower repays the loan plus interest over a specified number of years until they own the property free and clear. Most traditional mortgages are fully-amortizing. This means that the regular payment amount will stay the same, but different proportions of principal vs. interest will be paid over the life of the loan with each payment. Typical mortgage terms are for 30 or 15 years.