Telemetry is the data the car records as it goes around the track: how fast it is going, how hard the driver is pushing the throttle and brake, which gear it is in, and more. This tool plots that data for one or two drivers across a single lap, lined up by distance around the circuit, so you can see exactly where one driver is faster or brakes later than another. When two drivers are shown, a delta panel below tracks how many seconds apart they were through the lap. Its axis is lap time, so at 40 seconds in you can read the gap straight off. The track map colours each part of the lap by whoever was quicker there.