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When you’re building an infrastructure that is distributed all over the internet, you’ll come to a point where you can’t rely on synchronous remote calls that, for example, synchronize data on 2 servers: 1. You don’t have any failover system that resends messages if something went wrong (network outages, software failures). 2. Messages are processed over time and you have no control if something goes overloaded by too many requests. Even if you don’t have to send messages all over the Internet there are enough points of failures where something can go wrong. You want a reliable and durable system that fails gracefully and ensure.