Eventual Consistency is the term most people refer to when they are reading from a different data source from where they perform a write. Usually leads to a bad user experience where a user performs some action but then doesn't see their change reflected in the UI immediately. There can be many reasons for this. It could be from using a read replica that is eventually consistent. If you're using Event Sourcing with Projections as your Read Model, which is built asynchronously. Or if you're processing commands asynchronously via a message queue.

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0:00 Intro
0:39 Replication Lag
1:47 Event Sourcing Projection
2:48 Async Processing
4:53 Server Wait
6:14 Client Polling
7:12 Push to Client
8:38 Read from Primary
9:59 Multi-User

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