Definition
Asynchronous processing means that a sender dispatches a request and continues without waiting for the response. The result is retrieved later - via callback, polling, webhookHTTP callback that sends data to external system in real-time upon an event., or message queue. The opposite is synchronous communication, where the sender blocks and waits. Asynchrony is fundamental in modern distributed systems: it increases throughput, tolerates transient failures more gracefully, and makes systems more scalable. ElhubNational hub for metering data and market processes in the Norwegian electricity market. communication is necessarily asynchronous: an E01 message is sent, and confirmation (E02) may arrive minutes to hours later. CIS systems that expect synchronous responses from Elhub are incorrectly designed. Async/await is the modern programming language abstraction for handling asynchronous operations without callback hell. Message queues (KafkaDistributed event streaming platform - widely used for real-time data pipelines and event-driven architectures., RabbitMQOpen-source message queue for asynchronous and reliable communication between services.) are the infrastructure that enables asynchronous system communication at scale.