A less common but still important gate is called an exclusive oR gate, abbreviated as XoR. An XOR gate has only two inputs, unlike the OR gate, which may have several inputs. However, the XOR is similar to the OR gate in that it generates a 1 output if either input is a 1. The exclusive OR is different when both inputs are 1s or 0s. In that case, the output is a 0. below Figure shows the truth table for an XOR gate.