What's a "3D LUT"?

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What's a "3D LUT"?

I use darktable as my raw converter.

I have installed a pack of Fuji film simulations in 3D LUT format.

When I switch off the default Filmic RGB module, and use the LUT module instead, I prefer the colours.

What are 3D LUTs and what is happening with the colours?

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