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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 hour, minute, and second hands all move continuously. Halfway between 2:00 and 3:00, the hour hand will be pointing halfway between the 2 and the 3. In a digital clock, the numbers simply shift between discrete states: halfway between 2:00 and 3:00, the hour digit will still read 2.
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 hour, minute, and second hands all move continuously. Halfway between 2:00 and 3:00, the hour hand will be pointing halfway between the 2 and the 3. In a digital clock, the numbers simply shift between discrete states: halfway between 2:00 and 3:00, the hour digit will still read 2.
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]]s 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 halfway up or down. Analog [[television]]s 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.
==Disadvantages of Analog Systems==
==Disadvantages of Analog Systems==