A guitar pedal is the name given to a self-contained device designed to transform the output from a guitar before going to an amplifier.
Also known as an effects pedal or stomp box.
Always requires a power source (in my experience), usually a square 9-volt battery or a transformer.

Typical effects would include:
...and many, MANY more!

Also related is a pedal board which contans many different effects in a larger board like structure, as opposed to the guitar pedals small box-like shape which can only (usually) do one effect.

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