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, 21:00, December 30, 2015
A '''bit''' is a single [[binary]] character. it is either a zero or a one. This is because data is stored in a "yes/no" format. On a magnetic drive, a point it magnetized as positive or negative. Based on this magnetism, this bit is read as a one or a zero. Optical drives have the foil backing melted in points to make these bits. Flash memory uses physical switches, which are set to "yes" or "no" (one or zero) by electric impulses.
Regardless of the storage method, there is always a one or a zero. For ease of use, bits are often grouped together by eights, into what is known as a [[byte]].