What a VIN actually encodes
Look through the windshield, driver’s side, down on the dash. That metal plate is how a shop, an insurer, and a state office agree they are talking about the same car.
On a U.S. vehicle the VIN is 17 characters, and it skips I, O, and Q so nobody reads a one as an I. You will see the same string on the door sticker and on the title. The plate in the glass is the one to trust if those disagree.
The first three characters are the world manufacturer identifier. They name the company and the region that built the car, not the store that put a balloon on the antenna.
The next six walk the hardware: model line, body, engine, restraint system, then a check digit. That last one is math on the other characters. It exists so a mistyped number fails, not so a buyer can decode a secret.
The last eight are the vehicle identifier section: a model-year code, a plant code, and a serial. Two cars from the same plant in the same year should not share that serial.
A VIN is not a GPS beacon. It is not a title, and it will not tell you what someone paid or whether the paper is clean. Service records hang off it. So do recalls. If a window sticker, a title, and the plate disagree, stop and read the plate in person. It only says which vehicle you are standing in front of.