Question

What are universal gates why they are called so?

Answer 1

Nand and Nor gates are called universal gates.They called so as since any logic function can be done with Nand and Nor gates.

Answer 2

There are two universal gates i.e., NAND and NOR.

They are known as the universal gate because any logic gate can be constructed by using these universal logic gates. Any logic function can be derived by making the use of these two gates.

NAND is formed from the combination of two of the fundamental logic gates, i.e., NOT gate and AND gate. While NOR gate is constructed using NOT gate and OR gate.