A mortgage is a loan that is used to purchase residential and commercial property, using the property as security for the debt. Mortgages taken out for residential property are usually over the course of 25 years though this can differ depending on the individuals income and financial status. A wide choice of lenders are available, ranging from high street banks and building societies to specialist mortgage brokers and lenders who cater for the 'sub-prime' market. It is recommended that you always choose lenders or brokers that are members of and approved by The Association Of Mortgage Intermediaries.