You’ve got some good answers about what they *are* already but I want to address the names.
They’re not actually spinning, and they’re not actually coloured. They’re too small to have visible colours anyways. The red/green/blue thing is just describing a property of quarks that we *call* “colour”, but we could just as easily have called them spicy quarks, salty quarks, and bitter quarks, or bing/bong/pong quarks, or whatever.
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