Description: IObservable is an interface in C# that represents a provider of push-based notifications. This interface is part of the System namespace; its main purpose is to allow objects to subscribe to events and receive notifications when changes occur in the state of the observed object. IObservable is commonly used in reactive programming, where changes in data are asynchronously notified to subscribers. The interface defines a method called Subscribe, which allows consumers to register to receive updates. By implementing IObservable, developers can create data streams that can be observed, facilitating the creation of more reactive and efficient applications. This notification capability is especially useful in applications that require constant updates to the user interface or in systems where data changes frequently. IObservable is complemented by the IObserver interface, which is responsible for receiving notifications sent by the observable object. Together, these interfaces form the foundation of reactive programming, allowing developers to handle events and data more effectively and elegantly.