> ## Documentation Index
> Fetch the complete documentation index at: https://documentation.aibydna.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Delta

> A meaningful state change, and the starting point for every decision.

A Delta is a meaningful state change that records that a state field changed from one value to another and should always
include the corresponding [State](https://documentation.aibydna.com/desp/concepts/state.md) event type.

A Delta may originate from any [connected system](https://documentation.aibydna.com/desp/concepts/connected-system.md) and can refer to any meaningful state change in the [environment](https://documentation.aibydna.com/desp/concepts/environment.md).

To better think of what a Delta is? answer the following question:

> “What changes do you think, once they become known, will contribute to a better understanding of the environment current state and can help lead to more effective decision-making?”

A Delta is not just an event notification. In D.E.S.P, a Delta is the starting point for impact evaluation, dependency resolution, governance checks, trigger planning, and evidence recording.


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