Frequency in electronic circuits refers to the number of complete cycles of a periodic waveform that occur in one second. It is measured in Hertz (Hz) and represents how many times a signal oscillates or repeats within a specific time period. In electronic circuits, frequency is a crucial parameter that determines the behavior of components and the overall performance of the circuit. It affects various aspects such as signal transmission, filtering, resonance, and power consumption. By controlling and manipulating the frequency of signals in electronic circuits, engineers can design and optimize circuits for specific applications and functions.