## Module state

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Learn about the state in Substrate.

## §State

The state is abstracted as a key-value like database. Every item that needs to be persisted by the State Transition Function is written to the state.

### §Special keys

The key-value pairs in the state are represented as byte sequences. The node doesn’t know how to interpret most the key-value pairs. However, there exist some special keys and its values that are known to the node, the so-called `well-known-keys`.