Also known as OR circuit, logic and circuit. If only one of several conditions is met, an event will occur. This relationship is called OR logic relationship, and the circuit with OR logic relationship is called OR gate.

The OR gate has multiple inputs and one output. As long as one input is high (logic "1"), the output is high (logic "1"). Only when all inputs are low (logic "0") will the output be low (logic "0").

The correlation is as follows

Or gate is a circuit to realize logical addition, also known as logical and circuit, or gate for short. This circuit has more than two inputs and one output. As long as one or several inputs are "1", the output of the OR gate is "1". The output is "0" only when all inputs are "0". The mathematical logic expression of OR gate is:

Or gate has three logical symbols, including: shape characteristic symbol (ANSI/IEEE STD 91-1984), IEC rectangular national standard symbol (IEC 606 17- 12) and DIN symbol (DIN 40700).