An interest rate is the percentage paid on deposited money over a set period. Banks and fintech apps use it to reward customers for keeping funds in an account, and promotional rates are often used to attract new balances quickly. In consumer finance, even a small change in the rate can influence where users store money and how long they keep it there.
In cyber security, interest rates matter because they are a common lure in phishing, fake investment sites, and account-takeover scams. Attackers may promise unusually high rates to steal credentials, payment details, or one-time codes. Defenders watch for suspicious offers, cloned banking pages, and fraud patterns that exploit rate promotions. Clear disclosures, strong authentication, and verified account channels help reduce abuse.