| #https://www.notion.so/n8n/Frontmatter-432c2b8dff1f43d4b1c8d20075510fe4 | |
| contentType: overview | |
| # 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. | |