Definition
A broker is a person or a company that helps investors buy and sell financial assets like stocks, bonds, or mutual funds. They act as a middleman between the investor and the stock market.
Example
As an investor, if you want to buy shares, you cannot directly go to the stock exchange. You will need a broker (a firm and their investing/trading app) to place the order on your behalf.
Caution
Brokers usually charge fees or commissions for their services. Investors should choose a reliable broker and understand the charges before trading.