Event Sourcing is a design pattern that enables developers to maintain the state of an application by storing all the changes (events) that have affected its state over time. This pattern treats changes as a series of events that can be queried, interpreted, and replayed to recreate past states or predict future states.
In traditional systems, we usually save the latest state of the data. However, in the event sourcing pattern, instead of storing the current state, all changes to the application state are stored as a sequence of events. This creates a comprehensive log that can be used to recreate the state of the system at any given point in time.