If you've got principal, you can make money. Principal earns interest for its owner. For a savings account, the owner is the investor, and the bank pays interest to the investor. For a loan, the owner is the bank (or other entity), and the borrower pays interest.
In the case of a savings account, the principal grows as interest payments are added. In the case of a loan, the principal decreases until it reaches zero, at which point the loan is paid off.
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