Interest loans refer to a type of loan where the borrower is charged with interest for using someone else's money. This means that in addition to repaying the principal amount borrowed, the borrower will also have to pay additional charges for the use of the lender’s funds. The interest rate is typically calculated as a percentage of the loan amount and is usually paid back on a regular schedule over the life of the loan. Interest loans can be obtained from various sources such as banks, credit unions or online lenders.