Event-Driven Systems are architectures that respond to specific events or changes in state, rather than following a predetermined sequence of operations. These systems are designed to react to inputs, such as user actions or sensor data, allowing for more dynamic and flexible interactions. Common examples include web applications and IoT devices, where actions are triggered by events like clicks or temperature changes. In an Event-Driven System, components communicate through events, which can be messages or signals. This decouples the components, enabling them to operate independently and scale more easily. Technologies like message queues and event streams facilitate this communication, enhancing system responsiveness and efficiency.