# System Structures

Each app starts with several **system structures**:

![](https://3071851461-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M4Nnmtk9_gFGWOddsf6%2F-M5HPqI309cOITeGqepT%2F-M5HQveTWoxtgTKFaXiV%2Fsystem_structures.jpg?alt=media\&token=6c1e3a76-fccd-4a7a-8338-46196395d8a2)

### Frequently used system structures:

| Folder              | Structure name           | Structure system name | What is it for?                                                                                                                                                     |
| ------------------- | ------------------------ | --------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Root/               | **App users**            | `WebUser`             | Objects are your app users. [RBAC is based](https://readme.directual.com/data/data-structures/broken-reference) on the properties of the objects from **App users** |
| Root/               | **Files**                | `FileUpload`          | [File storage](https://readme.directual.com/data/file-storage)                                                                                                      |
| Root/ System/       | **App global constants** | `GlobalVariables`     | Data structure for storing[ global constants](https://readme.directual.com/scenarios/using-variables/global-constants)                                              |
| Root/ Integrations/ | —                        | —                     | Contains data structures for your [integrations](https://www.directual.com/integrations)                                                                            |

### Less frequently used system structures:

| Folder              | Structure name       | Structure system name | What is it for?                                                                |
| ------------------- | -------------------- | --------------------- | ------------------------------------------------------------------------------ |
| Root/ System/       | **User sessions**    | `WebUserSession`      | Store sessions for **App users**                                               |
| Root/ System/       | **Social sessions**  | `SocialUser`          | Store connection to social accounts (Facebook, Google, etc.) for **App users** |
| Root/ System/ Logs/ | —                    | —                     | Store app logs, which you can see on the Dashboard                             |
| Root/ System/ Logs/ | **Import data logs** | `ImportInformation`   | Data import operation status for objects                                       |


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