> For the complete documentation index, see [llms.txt](https://www.ngxs.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.ngxs.io/master/readme/intro.md).

# Overview

There are 4 major concepts to NGXS:

* Store: Global state container, action dispatcher and selector
* Actions: Class describing the action to take and its associated metadata
* State: Class definition of the state
* Selects: State slice selectors

These concepts create a circular control flow traveling from a component dispatching an action, to a store reacting to the action, back to the component through a state select.

![](https://3087215050-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-L9CoGJCq3UCfKJ7RCUg-887967055%2Fuploads%2Fgit-blob-7371002ded66c4455ca986a4c8e7c1f6849ffef9%2Fdiagram.png?alt=media)