- It is a NOT – AND gate.
- By connecting a NOT gate in the output of an AND gate we get NAND gate.
- Its output is given Boolean equation
**This gate gives an output of 1 if its both inputs are not 1,**means output will be 1 if either A or B or both are 0.

**NAND GATE IS A UNIVERSAL GATE**

- NAND gate is also called universal gate because it can perform all the three logic function of an OR gate, AND gate and inverter.

**XNOR GATE**

- It is known as a not-XOR gate
- Its logic function and truth table are just the reverse of those for XOR gate.
- This gate has an output 1 if its both inputs are either 0 or 1.
- It means to get an output 1 , its both inputs should be at the same logic level of either 0 or 1.
- So it produces no output (0) if its two input are at the opposite logic level.