How does a high-yield savings account work?

A high-yield savings account works like a regular savings account, but it pays a higher annual percentage yield, or APY. APY is the number that reflects the interest rate plus compounding, so it shows what you actually earn over a year instead of just the headline rate.

The important detail is that the yield can change, because many savings accounts are variable-rate accounts. The account is still a bank deposit, not an investment account, and at an FDIC-insured bank your eligible deposits are protected up to the standard insurance limit of $250,000 per depositor, per insured bank, for each ownership category. In plain English: the higher yield is about the rate, not about taking on stock-market risk.

That is also why the APY matters more than a flashy promo headline. A bank can advertise a bonus or a temporary rate, but APY is the number that tells you what the account pays after compounding, which is what actually affects your balance over time.