It means the number of data "bits" that make up the information that tell
the video card and monitor what colors, shades and etc to display for each
pixel on the screen.
8-bits (i.e. 256 shades) of Red, Green, and Blue per pixel .. with 8
bits left over for strange uses (c.f. 24 bit colour, which is the same,
without the spare bytes). 32-bit just happen to be easier to work with
on word-aligned memory machines.
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