What is event-driven architecture?

A way of organizing how systems work together around “what happened” — for example, “order paid” automatically triggers order preparation and invoicing.

In detail

Traditionally, systems check for new data at set intervals. In an event-driven approach, when something happens the system immediately sends out a notification, and the other systems that care about it each handle it on receipt. Responses are faster and systems depend less on one another.

For example

Once the “order paid” event is published, the warehouse system starts preparing the goods, the finance system issues an invoice and the CRM updates the customer's purchase history, all at the same time.

How companies use it

Suited to scenarios that need a real-time response, where several systems care about the same business change.

Common misconceptions

Too many events with too little logging. When something goes wrong, it is hard to trace which step failed to handle it.

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