Observables in Angular In Angular,  Observables  are a foundational mechanism for managing asynchronous data streams and event handling. They offer a powerful, flexible way to react to changing data over time.   Key Features of Observables Unlike Promises that emit a single value, Observables can emit multiple values over time — ideal for continuous streams like user input, live data, or WebSockets. Observables are lazy — they only start emitting values when explicitly subscribed to. This improves performance and avoids unnecessary computation. You can unsubscribe from an Observable using .unsubscribe() to clean up resources and prevent memory leaks. Observables leverage the  RxJS  library, which provides a rich set of operators like: map, filter, debounceTime, mergeMap, etc. These enable powerful, declarative transformations and compositions of data streams. Observables are deeply embedded...