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An analog system is a [[mathematics|mathematical]] system in which numbers vary continuously instead of shifting between discrete states as a [[digital]] system does. For example, in an analog clock the little hand points to the hour and the big hand points to the minute and a bigger hand points to the second and all three of these hands move continuously. In a digital clock the numbers simply shift between discrete states.  

An '''analog''' system is a [[mathematics|mathematical]] system in which numbers vary continuously instead of shifting between discrete states as a [[digital]] system does. For example, in an analog clock the little hand points to the hour and the big hand points to the minute and a bigger hand points to the second and all three of these hands move continuously. In a digital clock the numbers simply shift between discrete states.  

A slide rule is an analog calculator whereas an abacus is a digital calculator because the slide rule's numbers vary continuously whereas the abacus' numbers are either all the way up or all the way down, there is no meaning for a bead on an abacus that is half way up or down. Analog [[television]] are operated by machinery where the numbers vary continuously, whereas in digital television the numbers shift between discrete states, this is also true of analog computers and digital computers.  

A slide rule is an analog calculator whereas an abacus is a digital calculator because the slide rule's numbers vary continuously whereas the abacus' numbers are either all the way up or all the way down, there is no meaning for a bead on an abacus that is half way up or down. Analog [[television]] are operated by machinery where the numbers vary continuously, whereas in digital television the numbers shift between discrete states, this is also true of analog computers and digital computers.