High-yield savings accounts at online banks and credit unions offer 3.5–4.5% APY, about 10 times higher than traditional banks. They are fully liquid, FDIC or NCUA insured up to $250,000, and suitable for emergency funds and short-term savings. Rates may decline due to expected Federal Reserve cuts. Key factors to compare include APY, minimum balances, fees, transfer ease, and app quality. Interest is taxed as ordinary income.