The following figures shows a logic gate circuit with two inputs A & B and the output C. The voltage wave forms of A, B & C are as shown below . The logic gate is

According to data truth table is given as

                         $\begin{array}{lll}A& B& {\rm Y}\\ 0& 0& 0\\ 1& 1& 1\\ 0& 1& 1\\ 1& 0& 1\\ 0& 0& 0\\ 1& 1& 1\end{array}$

This truth table indicates truths table of OR Gate

          So Given logic gate is OR Gate