* Definition of "model": What constitutes a distinct model is subjective. A minor trim change (e.g., adding a sunroof) might be considered a new model by some, but not others. Variations in engine size, body style (sedan vs. coupe), and features blur the lines.
* Incomplete records: Records from early automotive history are often incomplete or lost, especially from smaller manufacturers.
* Global scope: Tracking every car ever produced worldwide across numerous countries and manufacturers is an incredibly difficult task.
While a precise number is impossible, it's safe to say the number is in the tens of thousands, possibly even exceeding that. Thousands of manufacturers, both large and small, have existed throughout automotive history, each producing numerous models over time.
