A logic gate is a particular electronic circuit to execute a certain logic that we are interested.The kind of
logic that you want to execute depends on the requirement.

For example assure that you’re having a fan that has to be switched on.Let it has two switches available at the two sides of a room.If you want the fan to be switched on when at least one of that switches is on, the kind of the logic that you shall execute is similar to OR gate logic.

For example assure that you’re having a fan that has to be switched on.Let it has two switches available at the two sides of a room.If you want the fan to be switched on when at least one of that switches is on, the kind of the logic that you shall execute is similar to OR gate logic.

And if you would like to have your fan to be switch on only
when both the switches are on, then the kind of the logic that you want to execute is called

**and**the gate logic. Whenever the switches on if you want the fan to be switched off and vice versa, then the kind of the logic that you are looking for is actually a NOT gate.All this logic gates works basing an algebra called Boolean algebra.OR gate works basing on the union logic,AND gate basing on intersection logic and NOT gate basing on negation logic of mathematics.

**OR gate**

This works basing on the union
function of the mathematics. You might know that if there are two functions and
we will write the member in the union function when it exists at least in any one of the functions.

**AND GATE**

This works basing on intersection
function of the mathematics.The
output will be on when only both the inputs are on in this kind of the gate.
The NOT gate just reverse the input that is given and make it as the output.

**NOT gate**

NOT gate is a negation gate.
Whatever the input that is given,IT will be just reverse that INPUT. That means if the input is ON, the output will be OFF and vice versa.

This three gates are called BASIC
gates which are going to be useful to execute basic logic that we wish to
execute in any electronic circuit. Anyway there are further hybrid gates
available in the logic gates called NOR and NAND Gates.

**NOR gate**

NOR gate is the combination of
OR gate and NOT gate. The results of this gate is the
negation results of the OR gate. The
truth table of the gate is shown below. This gate is also called as a universal
gate because we can get all the basic gates with this gate.

**NAND GATE**

NAND gate is a combination of
NOT gate and AND gate. The output of this gate is reciprocal
of the AND gate. This gate is also called as a universal gate. The
truth table of the gate is shown below.

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