A) An Operating System (OS) is software that manages computer hardware and software resources and provides common services for computer programs. It acts as an intermediary between the user and th

a) An Operating System (OS) is software that manages computer hardware and software resources and provides common services for computer programs. It acts as an intermediary between the user and the computer hardware.

b) Three physical strains a person may suffer when using a computer incorrectly or for prolonged periods are:

1. Eye strain (or Computer Vision Syndrome)
2. Repetitive Strain Injury (RSI), such as carpal tunnel syndrome
3. Back or neck pain due to poor posture