A gearmotor is a speed reducer with a directly connected motor. A gearmotor does not use a bell and coupling adapter to mount the motor, the motor is in fact part of the speed reducer. A first advantage of the gearmotor compared to another combination of motor and gearbox is the length. Geared motors are compact in size. If you want to buy gears, read this article because it can help a lot.
A geared motor typically has the input gear of the gearbox mounted directly on the motor shaft. Gearmotors are mechanically simpler than other combinations of motors and gears. A gearmotor does not use couplings and has fewer bearings. As a result, installation is simplified and less maintenance is required. There are no belts to be tensioned or shaft alignment requirements. Some belt covers wear and require replacement; because a gear motor does not include these parts, the cost of installation and maintenance will be reduced.