Synchronous circuits are digital circuits that operate based on a clock signal. This clock signal coordinates the timing of all operations within the circuit, ensuring that data is processed in a predictable manner. Each component in the circuit, such as flip-flops and registers, changes its state only at specific moments defined by the clock, which helps maintain data integrity. These circuits are widely used in various applications, including computers, communication systems, and digital signal processing. The use of a clock allows for easier design and analysis, as all parts of the circuit can be synchronized, reducing the chances of errors that can occur in asynchronous circuits.