OR Gate Using NOR Gate

An OR logic Gate can be made using NOR logic gates. As we know, NOR is a universal logic gate, meaning it can be used to build other basic logic gates such as NOT, OR, AND, NAND, XOR, and XNOR. Implementing an OR gate using a NOR gate is useful when you need an OR logic circuit but only have NOR gates available; an OR logic gate is unavailable.