Quick Answer
Reactive programming in Java handles async event streams with backpressure. Libraries: Project Reactor (Spring WebFlux) and RxJava. Core types: Mono (0 or 1 element), Flux (0 to N elements). Operators: map, flatMap, filter, zip. Backpressure lets consumers signal producers to slow down. Benefits: non-blocking end-to-end, high throughput with few threads, composable async pipelines.
Answer
Reactive programming uses asynchronous, non-blocking data streams. Implemented via libraries like RxJava and Reactor. Useful for microservices, streaming, and event-driven systems.
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Verified Answer
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