Protocols are the license of chip tuning tools. Most chip tuning tools can tune cars, bikes, trucks, agricultural vehicles and boats. The protocols are the licences that allows the tuning tools to tune all the above-mentioned vehicles.
Most of the tuning tools have different protocols options. For example, if you plan on tuning cars, you can buy tuning protocols for cars or if you plan on tuning trucks you can buy the protocols for trucks. The more protocols that you add to the tuning tools, the more expensive the tuning tool becomes