What it means
The VIN is a unique 17-character code of letters and digits (never I, O or Q) used since 1981. It encodes the maker, model, body, engine, model year, plant and serial number. It is on the windshield, the door pillar, the title and every Copart and IAAI listing.
What it means for a buyer
Check the VIN before you buy any used car from the US: on vinlama you will see if it went through a salvage auction, with damage and photos. Make sure the VIN on the car matches the documents.