Middleware takes care of messaging, scalability and error recovery. Derived patterns include: Message Bus, Service Mesh, Event Mediator and ESB.

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Middleware acts as a low-level layer providing connectivity and communication for a system of services, improving scalability and error recovery. It's commonly used in backend systems, offering variants such as message brokers, service meshes, and enterprise service buses. Middleware enhances dynamic scaling, helps in deployments, and ensures message delivery but may introduce latency and complexity.