What is a car broker and how is it different from Carvana or CarMax?

A car broker works on your behalf to bring your car to multiple buyers, rather than making you a single offer. Carvana and CarMax are each one buyer with one price. A broker like Vantage presents your vehicle to multiple buyers so you can compare the offers they return. The broker does not buy the car themselves, which means they represent your interest as the seller rather than their own interest as the buyer.