What is a reducer? What is its core function?

A reducer is a power transmission device that reduces the input speed (such as motor speed) through transmission mechanisms such as gears and worm gears, while increasing the output torque.
Core role:

Matching load requirements: Many devices require low speed and high torque, while motors usually output high speed and low torque, and reducers play a "bridge" role.

Protect equipment: Prevent motor damage due to overload and extend system life.