What does the torque indicate in the context of the drive units?

Torque is measured and indicated in Newton metres (Nm). It describes the force with which you pedal (pedal force), or the force generated by your motor, and is responsible for how fast you can accelerate. The maximum torque is mostly used when accelerating or climbing steep hills and is not permanently available. A higher torque results in more powerful acceleration or enables the transportation or movement of heavier loads. 

To call up the maximum torque of the motor, a corresponding pedal force or torque is also required from you. This depends on the riding mode and its support factor.

Relationship between torque and cadence

Torque, together with cadence, is a component of power. If you compare two drive units with the same maximum power and different maximum torque, you will see that maximum power is achieved by the motor with the higher torque at a lower cadence. Conversely, this means that to achieve the maximum power of the motor with the lower torque, you need to pedal faster.