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#https://www.notion.so/n8n/Frontmatter-432c2b8dff1f43d4b1c8d20075510fe4
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# Data mapping
Data mapping means referencing data from previous nodes.
This section contains guidance on:
* Mapping data in most scenarios: [Data mapping in the UI](/data/data-mapping/data-mapping-ui.md) and [Data mapping in expression](/data/data-mapping/data-mapping-expressions.md)
* How to handle [item linking](/data/data-mapping/data-item-linking/index.md) when using the Code node or building your own nodes.
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