In terms of electronics, a 'logic' circuit acts on data having only two values, namely 1 or 0. Another word also used to describe a logic device is 'digital'.
Microprocessors and digital memory are examples of logic devices.
Engineers also use 'Logic Algebra' or 'Boolean Algebra' to work out how a device such as a microprocessor is meant to work. The logic operations are
AND - output is true if both inputs are true
OR - output is true if either inputs are true
NOT - output is true if the input is false
XOR or EXCLUSIVE OR - output is true if one of the inputs are true. If both are true then the output is false.
The opposite of a logic circuit is an 'analogue' circuit such as the radio part of a mobile phone where the output is a continuous value between maximum and minimum.
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Click on this link: Logic circuit