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

# Contextualization

> Match entities, extract features from engineering diagrams, and analyze images in Cognite Data Fusion (CDF).

The contextualization APIs help you connect and enrich industrial data. Use entity matching to link entities across data sources, engineering diagrams to detect and convert P\&IDs, and vision to extract features from images. These APIs enable you to build relationships between disparate data and automate visual analysis.

## APIs in this group

* [Entity matching](/api-reference/concepts/20230101/entity-matching) — Match entities across data sources using machine learning (including **pipelines** and **advanced joins** in preview API references where available)
* [Engineering diagrams](/api-reference/concepts/20230101/engineering-diagrams) — Detect annotations and convert P\&IDs and process flow diagrams
* [Vision](/api-reference/concepts/20230101/vision) — Extract features, objects, and text from images