# Concepts

* [Why the hand interaction is important?](https://www.xrdev.app/mixed-reality-docs/lessons/lesson-3/concepts/why-the-hand-interaction-is-important)
* [What are gestures?](https://www.xrdev.app/mixed-reality-docs/lessons/lesson-3/concepts/what-are-gestures)

![Hand interactions on HoloLens 2](https://1227696974-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LoMjAI1irMPA8c0ezFQ%2Fuploads%2Fgit-blob-d161336484065347d98d75cc2f6fbde30de07e38%2Fux_hero_handray.jpg?alt=media)