Which type of gate outputs true if at least one of its inputs is true?

The type of gate that outputs true if at least one of its inputs is true is indeed the OR gate. An OR gate performs a logical operation where the output will be high (true) whenever one or more of its inputs are high (true). For instance, in a two-input OR gate, the output is only false if both inputs are false; in all other cases — including when either or both inputs are true — the output is true. This characteristic makes the OR gate fundamental in digital circuits where combining signals is necessary.

In contrast, the AND gate requires all inputs to be true for its output to be true. The NAND gate, being the inverse of the AND gate, produces false only when all inputs are true. The XOR (exclusive OR) gate outputs true if exactly one of its inputs is true but not both, which contrasts with the inclusive nature of the OR gate. Understanding these differences highlights the unique functionality of the OR gate in logic design.