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How do I invest and buy/sell stocks?  What does “use a broker” mean?
Some good answers already, but let me add a TL:DR version. Brokers work like a special type of bank account where you can deposit or withdraw money. The major difference is that they also give you the ability to buy/sell investments with the money in your account which you can do by either calling them or using their website. Important: Many investments you will make through a broker(e.g. stocks) are not insured against losing value like the money in your bank account.