Question

What is interest and what is it used for?

Answer 1

Interest, in finance and economics, is payment from a borrower or deposit-taking financial institution to a lender or depositor of an amount above repayment of the principal sum (that is, the amount borrowed), at a particular rate. It is distinct from a fee which the borrower may pay the lender or some third party.

Answer 2

Interest is the monetary charge for borrowing money—generally expressed as a percentage, such as an annual percentage rate (APR). Key factors affecting interest rates include inflation rate, length of time the money is borrowed, liquidity, and risk of default. Interest can also express ownership in a company.

I found that on internet XD