A clock signal is a timing signal used in digital circuits to synchronize operations. It oscillates between high and low states, creating a regular pulse that helps coordinate when different components, like microprocessors and memory, should perform their tasks. This ensures that data is processed in a precise order, preventing errors. Clock signals are essential in various electronic devices, including computers and smartphones. They determine the speed at which a device operates, measured in hertz (Hz). A higher frequency means more cycles per second, allowing for faster processing and improved performance in digital systems.