Let two inputs are $A$ and $B$. The circuit can be shown as :
The two gates shown are NAND gates.
The output of gate $-1, Y _{1}=\overline{ A \cdot B }$
The output of gate $-2, Y =\overline{ Y _{1} \cdot Y _{1}}$
or $Y =\overline{\overline{ A \cdot B } \cdot \overline{ A \cdot B }}$$=\overline{\overline{ A \cdot B }} $$= A \cdot B$
Thus, the combination behaves as it is an AND gate.
It is the gate, where a circuit performs an AND operation. It has n number of input where (n >= 2) and one output.
OR Gate
It is the gate, where a circuit performs an OR operation. It has n number of input where (n >= 2) and one output.
NOT Gate
An inverter is also called NOT Gate. It has one input and one output where the input is A and the output is Y.
NAND Gate
A NAND operation is also called a NOT-AND operation. It has n number of input where (n >= 2) and one output.
NOR Gate
A NOR operation is also called a NOT-OR operation. It has n number of input where (n >= 2) and one output.
XOR Gate
XOR or Ex-OR gate is a specific type of gate that can be used in the half adder, full adder, and subtractor.
XNOR Gate
XNOR gate is a specific type of gate, which can be used in the half adder, full adder, and subtractor. The exclusive-NOR gate is flattened as an EX-NOR gate or sometimes as an X-NOR gate. It has n number of input (n >= 2) and one output.
