Event-Driven Architecture

Event-driven architecture is a way of building software where parts of the system react to things that happen, called events, rather than constantly asking each other for updates. When a customer places an order, that event quietly triggers the invoice, the stock update and the confirmation email on their own.

It is like a doorbell: visitors ring when they arrive, so you do not have to keep opening the door to check. This approach matters because it lets the pieces of a business's software work independently, so one busy or broken part is less likely to hold up the rest.