All the data store in your computer - every word, picture, number and sound - is captured as a series of electrical pulses that are either on or off. A number system called binary is used to represent these pulses with "1" meaning "on" and "0" meaning "off". A single binary digit known as a 'bit' , switches a single switch on or off. By linking together these switches , the computer can carry out the complex operations we demand.
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