So I've been thinking about this lately - most people don't really understand what a broker actually does or why they need one. Let me break it down because it's actually pretty fundamental to how markets work.

Basically, a broker is just an intermediary. Whether you're buying stocks, getting a mortgage, or selling your house, a broker is the person or firm that makes that transaction happen. They're everywhere in finance, and honestly, they're kind of essential. The thing is, "broker" covers a lot of different roles - stock brokers, real estate brokers, insurance brokers, mortgage brokers, commodity brokers. If something can be bought and sold, there's probably a broker for it.

Now here's where it gets interesting - how do brokers actually make money? This matters because it affects what kind of service you get. Traditionally, stock brokers earned commissions on every single trade. But that's basically dead now. Most online brokers charge zero commission for stocks and ETFs. However, real estate brokers? They still take a commission when a property sells, usually from the seller. Commodity brokers often still work on per-transaction fees.

Some brokers have shifted to a fee-only model instead - like charging 1% of your assets annually. Others make money off the spread, which is that tiny gap between the buy price and sell price. And then there are random account fees, inactivity charges, stuff like that.

Here's the key split you need to know: full-service brokers versus discount brokers. Full-service brokers give you the whole package - investment advice, portfolio management, retirement planning, the works. You get a personal relationship with them. But you pay for it. Discount brokers, the online ones, basically just execute your trades. Zero commission, but minimal advice. They're perfect if you know what you're doing and just want cheap execution.

Now, a broker isn't the same as a financial advisor. This surprises people, but a broker isn't legally required to act in your best interest - just to make "suitable" recommendations. A fiduciary advisor? They have to recommend what's actually best for you. Big difference.

Wealth managers are different too - they take a bigger picture approach, handling everything from investments to retirement planning to insurance. Investment bankers are a whole other thing - they work with companies and governments on major deals like IPOs and bond sales. Most people never deal with them.

So what are the actual pros and cons of using a broker? On the plus side, you get professional management, they handle the legwork, and you access a wide range of products. Downside? Fees and commissions eat into your returns, you have limited control sometimes, and there's always the risk of getting stuck with someone incompetent or shady.

The real question is whether a broker makes sense for your situation. For something like selling a house, yeah, you basically need one and it's worth it if they get you a better price. For stock trading, think about whether you want full-service support or if you can handle it yourself with a cheap online broker. Either way, shop around. The right broker can actually be one of the best decisions you make financially, but only if they actually add value for what you're paying.