An (electronic) “computer” is a device that can do binary calculations using things called “logic gates” (which represent stuff like “A AND B”). This means that any physical object which can do binary calculations using logic gates is also, technically, “a computer,” it’s just not a very efficient or practical one.
Redstone, in Minecraft, acts like a circuit. This means that it allows, or blocks, a flow of effectively “current” from one place to another. Using carefully-designed redstone circuits, it is possible to make logic gates, and with those logic gates, you can create a device that can add binary numbers together. Hence, it’s technically “a computer.” In practice, this is not very useful and is mostly just a stunt.
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