What is the lower device of an outboard engine

As the name suggests, the lower device of the outboard motor is the bottom part of the outboard motor, which converts the power of the engine into the rotation of the propeller.
If there is no outboard lower device, you can't go anywhere.
Therefore, it is very important to understand the various components and working principles of the outboard lower device.
Usually, the lower part of the hull includes a drive shaft, water pump, propeller, variable speed shaft, gearbox, and tail fin.
If the outboard motor is used for seawater applications, you will also see an anode on its lower device to protect the engine from corrosion.