What an auto broker actually does
A broker sits between a buyer and a seller and does the work that usually falls on one of them: finding the right vehicle or the right buyer, checking what can be checked, handling the conversation about price, and keeping the paperwork in order until the title changes hands. The point is not to own a lot full of cars. The point is to get a specific vehicle from the person who has it to the person who should have it, with fewer surprises for both.
That is different from the two routes most people know.
Compared with a dealership
A dealership buys vehicles, holds them as inventory and resells them. Its business depends on the gap between what it pays and what it sells for, so when you trade in, the offer reflects the dealer's reconditioning costs, holding time and margin. When you buy, you choose from what that dealer has on the lot or can pull from its network. Dealerships are convenient, and for many people that convenience is worth it. A broker works the other way around: it starts from what you need and looks for the vehicle, or starts from your vehicle and looks for the buyer.
Compared with selling or buying privately
A private sale can bring a seller more money than a trade-in, and a private purchase can cost a buyer less than a retail lot. The price of that is your time and your exposure. You write the listing, take the photos, answer messages, decide who is serious, arrange test drives with strangers, judge whether a payment is real and make sure the title is signed correctly. Buyers face the mirror image: little recourse if the description was wrong, and no one checking the history but them. A broker takes on that work and that screening, so you get closer to a private-sale outcome without running the whole process yourself.
How ABC is paid depends on the vehicle and the work involved. Fees, timing and responsibilities are confirmed with you in writing before you commit.