Firing up an F1 is the pinnacle of open wheel, single seater car racing and arguably the highest level of any motorsport globally.... There's more... car is a process that takes time and utilises an external car starter. The engine is so precise it has zero tolerance and it will not start if cold. So the engine and F1 cars use an 8-gear, sequential automatic transmission, meaning that there is a clutch, but no clutch pedal. The clutch... There's more... must be preheated before starting can be initiated.
F1 cars need to be as light as possible so there is no room for a starter on the car. Therefore an external unit inserted at the rear to fire up the car.
This is an older clip, referring to the V8, but the equipment and principal are exactly the same today.