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What's a computer?

Short Answer: A computer is a collection of electrical and mechanical devices that can accept input via input devices and can provide output via output devices.

Long Answer: A computer is a collection of electrical and mechanical devices that can accept human or electro-mechanical input via input devices and can provide visual, auditory and kinetic output via output devices.

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Human input is generally provided by moving and clicking buttons on a mouse, from pressing keys on a keyboard, writing on an electronic tablet, touching the screen or with spoken commands. Electro-mechanical input can come from a variety of data storage devices or from another, attached computer.
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Visual output is typically displayed on a monitor while audible output is played through speakers, while an example of kinetic output might be back pressure from a joystick.
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The mouse, keyboard, monitor and speakers are all connected to IO (Input/Output) ports on the computer.

A computer is as stupid as a stone and has no more value than a stone without an operating system and programs.