A mortgage uses what is called a mortgage note as proof that a loan has been issued for the purposes of providing income to subsidize a real property. Someone interested in purchasing a property can get a loan from a financial institution like a bank or from other sources. There are many different types of mortgages depending on the type of deal that is struck. These differences can be in the length of the loan, the interest rate and the actual amount of the initial loan. Mortgage loans exist because most people world over can not afford to buy a home with there saving, rather they need assistance to do so, a mortgage provides that assistance.