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Speaking of electronic devices, an appliance is generally locked down, and the manufacturer limits the number of use cases. You end up with something that is not a general-purpose computer, even though many use the same hardware as a computer would.

A game console is a classic appliance. You turn it on and see your current game running or a selection of games to play and you can start playing a game with zero intermediate steps.

The Steam Deck and Steam Box are designed as appliance emulators—they boot and by default operate in appliance mode. They can provide the same exact experience as a console if you use them as designed. They are also general-purpose computers, if you wish to step out of console mode.