The computer mouse is the main human interface for controlling a computing machine. Unlike other input methods, it’s well-suited to controlling an object in the real world because one can move around something on a surface just by moving their hand.
digital computers are limited devices that process data at high speed but lack awareness of what they are processing. They depend on user input to be given instructions about what data should be processed and how it should be done, but there is usually no feedback until all inputs have been issued – after which the results might not make sense if something was missed or misunderstood. Entering digital inputs one at a time is tedious and often produces errors due to misunderstanding meaning (“dumb” machines).