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On a regular Computer mouse, there is a Left click button, a Right click button, a scroll wheel, a motion detection sensor, and some sort of connection element.

The connective element is usually either a hard wire that connects directly to the computer or device, or a wireless transmitter and receiver that communicated to the computer or device without the need for a cable. The driver is usually installed upon first connection to a new device and is the thing that maps the buttons to executable command on the device; some mice allow you to change what each button does.

Functionality:
The left click button usually selects, drags

The Right click button normally allows for secondary options

The Scroll wheel usually allows for vertical navigation and sometimes allows for secondary function by pressing down

The motion sensor detects the movement of the mouse and translates it to the cursor.

Resources

Murmson, S. (2019). Parts & Functions of a Computer Mouse. Retrieved September 29, 2020, from https://www.techwalla.com/articles/parts-functions-of-a-computer-mouse