An electrical signal composed of a single conductor carrying a voltage which varies with respect to a reference voltage (usually ground), as opposed to a differential signal, which consists of complementary signals carried on each conductor.

An electrical signal composed of a single conductor carrying a voltage which varies with respect to a reference voltage (usually ground), as opposed to a differential signal, which consists of complementary signals carried on each conductor.

Single-ended signals are often easier to implement and may require fewer wires (since multiple signals can share a single reference voltage), but differential signals can reject noise which affect both signal wires (common mode noise).