Digital cameras save image data as digital numbers. Bits are the number of digits in a binary number. An 8 bit number 00000000 to 11111111 can have a value between 0 and 255 and in a camera 0 would be black and 255 would be white.
This means that there would be 255 shades of grey that can be represented. The more bits there are, the bit depth, the finer the resolution (the more shades or tones) that are available in an image and the better the representation of the image (more lifelike).
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