What is the difference between a small geared motor and a planetary geared motor

Small geared motors and planetary geared motors are the same, but they are called differently; both are assembled by a motor and a reducer.The motor provides speed, and the reducer adjusts the speed and output torque; the output speed of the small reduction motor and the planetary gear reduction motor is between 500rpm and can be adjusted; for example, the speed of the public electric curtain motor is very slow, but the torque is large, and the curtain can Rolls up at a very slow pace; it has various applications, often with custom power modes.
What is the difference between a small motor and a geared motor?
In fact, small motors are also gear reducers, but their power is relatively small and usually does not exceed. The reducer components are not single gear reducers, and sometimes equipped with worm gear reducers, linear reducers, etc.