Definition: Colour spaces describe how the red, green and blue primaries are mixed to form a given hue in the colour spectrum. Since it is not possible to represent every colour in the visible spectrum *exactly* by mixing amounts of red, green and blue, colour spaces allow us to change how we define red, green and blue (and white) to get better colour reproduction. By "tweaking" primaries in this way, we can maximize how many colours *can* be accurately represented on monitors, printers, etc. by matching the colour space closely to what the device is capable of reproducing. There are also colour spaces designed for photo editing that don't match *any* particular device, but are instead designed to give more "coverage" of the overall colour gamut (spectrum of visible light) for the purpose of photo editing.
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