Computer Monitors

A personal computer is a machine that manipulates data according to a list of instructions.

Errors in computer programs are called "bugs"

Bugs may be benign and not affect the Computer Monitors usefulness of the program, or have only subtle effects
But in some essentials they may consideration the program to "hang" - become unresponsive to input such as mouse clicks or keystrokes, or to completely fail or "crash"
Bugs are usually not the fault of the computer
Since computers merely execute the instructions they are given, bugs are nearly always the result of programmer error or an oversight fabricated in the program's design.