Logical operator
A logical operator acts upon one or more binary inputs to produce a single binary output
These are the logical operators
AND  output is true if all inputs are true
OR  output is true if any inputs are true
NOT  output is true if the input is false
XOR or EXCLUSIVE OR  output is true if any of the inputs are true. But if all inputs are true then the output is false.
With digital electronics, these operators can be carried out using equivalent logic gate hardware. For example the AND operation can be carried out with an AND gate and the NOT operation is carried out by a NOT gate or inverter as it is sometimes called.
A good way of understanding the logical operators is to use a truth table that lists every possible combination of inputs and its output.
These are the truth tables for each type, where A and B are binary inputs.
AND 


OR 


XOR 


NOT 


Engineers also use Logic Algebra or Boolean Algebra to work out how a device such as a microprocessor is meant to work.
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