A note is a legal financial instrument in which one party formally agrees in writing to pay a specified sum of money to another party under defined terms. It serves as a promise to repay a debt and is commonly used in loan agreements.

Key components of a note typically include the principal amount, interest rate, repayment schedule, maturity date, date and place of issuance, and the signature of the borrower (issuer).

Notes can be used for personal, business, or government lending purposes and provide legal protection to the lender by outlining the terms of repayment and the consequences of default.