Interest is the fee charged by a lender to a borrower for the use of borrowed money, usually expressed as an annual percentage of the borrowed amount. The rate of interest is generally dependent on the credit risk of the borrower, and the inflation rate.

OR; money earned by deposited funds. When you deposit money in an savings account you generally earn interest on the amount deposited.

Having partial or total ownership in an asset is also considered an interest. If you own a property which contains a mortgage, the lender has an interest in that property, as the funds that were loaned were secured by the property.

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