A mortgage also known as a loan is used by individuals or businesses to purchase property for sale or previously owned by another person. This loan is secured on the borrower’s property and is paid back with interest. If you're going to be responsible for paying a mortgage for the next 30 years, you should know exactly what a mortgage is. Most commercial banks have facilities to provide a mortgage which has three basic parts: a down payment, monthly payments and fees. The fees are all the costs you have to pay up front to get the loan. Building societies also provide mortgages.