Meaning – A button is a part of a mechanical pointing device, such as a mouse, that is used to initiate an interaction between the digital mouse pointer and some content on the screen on the computer. The button on a mouse is designed to have a downward travel when you press it, and usually produces a clicking sound as a form of audio feedback when you successfully click the specific mouse button.
The buttons on a computer are usually made out of plastic, but there are exceptions where you will find a metallic button. This does not make a difference as far as the action is concerned, but does impact the look and feel of the device itself.
Example of Usage – “The customer was pleasantly surprised to see metallic buttons on the PC, instead of the usual plastic ones that he was used to.”