# Concepts

Concepts are entities in the world that you want to search over, recognize, annotate, etc. For further details see our [concepts API docs here](https://github.com/Clarifai/docs/tree/1fde8ce20559136e6ac1e875864befea10f3f218/api-guide/concept/README.md).

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## Concept Best Practices

* Avoid special characters and spaces
* Avoid long concept names. Typically 1-3 word concepts are best.
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