Logical OR Gate
OR gate performs logical OR operation
which means outputs is logical 1 if at least one of the inputs is 1. Just like AND gate
an OR gate may also have two or any more numbers of inputs but only one output. Only if all of the inputs are only in low state or logical 0 the output is low or 0 and in all other inputs conditions the output will be high or logical 1.The logical symbol of OR gate is shown below, 
Truth Table of OR Gate
From above explanation the truth table
of logical OR gate can be represented as,
Logical OR gate can be of more than two inputs as we told earlier. In that case logical symbol and truth table would be, 

Realization of OR Gate
Like AND gate and OR gate can also be realized by using Diode
or transistor circuit.
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