1# Application State Management Overview 2<!--Kit: ArkUI--> 3<!--Subsystem: ArkUI--> 4<!--Owner: @zzq212050299--> 5<!--Designer: @s10021109--> 6<!--Tester: @TerryTsao--> 7<!--Adviser: @zhang_yixin13--> 8 9 10The decorators described in the previous topics are used to share state variables within a page, that is, within a component tree. If you want to share state data at the application level or across multiple pages, you would need to apply application-level state management. ArkTS provides a wide variety of application state management capabilities: 11 12 13- [LocalStorage](arkts-localstorage.md): API for storing the UI state, usually used for state sharing within a [UIAbility](../../reference/apis-ability-kit/js-apis-app-ability-uiAbility.md) or between pages. 14 15- [AppStorage](arkts-appstorage.md): special, singleton LocalStorage object within the application, which is created by the UI framework at application startup and provides the central storage for application UI state attributes. 16 17- [PersistentStorage](arkts-persiststorage.md): API for persisting application attributes. It is usually used together with AppStorage to persist selected AppStorage attributes to the disk so that their values are the same upon application re-start as they were when the application was closed. 18 19- [Environment](arkts-environment.md): a range of environment parameters regarding the device where the application runs. The environment parameters are synchronized to AppStorage and can be used together with AppStorage. 20