A mortgage is the contract between you and the lender that enables you to get a loan to purchase a property. 

It sets out the terms and conditions of how a lender will provide you with the money you need to buy your house or flat. 

This will include all your personal details, covering things like: the term (the period of time over which you'll pay the money back) and the interest rate (the rate of interest the lender will charge you for the loan). 

In the simplest terms, you're promising the lender you won't spend the money on something else, and that over time you'll pay it back.

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