Chip tuning is a process that involves modifying the software in a vehicle's engine control unit (ECU) to enhance performance. By adjusting parameters such as fuel injection, ignition timing, and boost pressure, chip tuning can increase horsepower and torque, improve fuel efficiency, and optimize overall engine performance. This tuning is typically done using specialized tools and software, allowing technicians to create a custom map for the ECU. While chip tuning can lead to significant improvements, it may also affect the vehicle's warranty and emissions compliance, so it's essential for car owners to consider these factors before proceeding.