A clock divider is an electronic circuit that reduces the frequency of a clock signal. It takes an input clock signal and produces an output signal with a frequency that is a fraction of the input. This is useful in digital systems where different components may require different clock speeds to operate correctly. Clock dividers are commonly used in various applications, including microcontrollers, digital signal processing, and synchronous circuits. By dividing the clock frequency, they help synchronize operations and manage timing within a system, ensuring that all parts work together efficiently.