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A firm or person that executes trades on your behalf.
A broker is a company or a person that buys and sells investments for you. Today most people use an online broker or a bank's trading app. The broker holds your account, executes your orders and may charge fees.
You open an account with an online broker, deposit money, then buy shares of an ETF through its app.
Fees, account types (like tax-advantaged retirement accounts) and protection rules differ between brokers. Choosing a regulated, low-cost broker matters over the long run.