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Gates are logic circuits. They take binary inputs and and gives out a binary result. 1(one) is represented by a positive electrical value and 0(zero) is represented by no electricity at all.

Logic IC's contain these and other types of gates. This section describes the different types of gates and their symbols:

AND gate -
To get an output of 1, both inputs must be at a value of 1.
OR gate -
To get an output of 1, one or more inputs must be at a value of 1.
NOT gate -
To get an output of 1, its input must be at a value of 0.
This gate only has one input. It is also known as an inverter circuit.
NAND gate -
To get an output of 1, one or more of its inputs must be at a value of 0.
NOR gate -
To get an output of 1, all inputs must be at a value of 0.