The term footswitch is frequently used to describe a box with 1 or more switches used to control channel and FX switching on an amp. There are other devices including FX units that can use footswitches. Footswitches are just switches that sometimes have circuitry that allows muxing switch signals on less wires.
Pedals generally are standalone units that are used to color your tone. They have switches and knobs on them. Oddly enough a pedal is not always a pedal at all in the sense that a pedal is something you push with your foot like a volume pedal. It's a generic term used to refer to all individual tone coloring devices. The term "expression" pedal is used to refer to a pedal on a multiFX unit that can be used to control volume, wah, and other FX. Or it can be a standalone volume-like pedal that is plugged into another unit for controlling parameters.
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