1# @ohos.app.ability.ExtensionAbility (ExtensionAbility Base Class)
2
3**ExtensionAbility** is the base class for scenario-specific ExtensionAbilities. It is inherited from [Ability](js-apis-app-ability-ability.md), with no property or method added. You cannot inherit from this base class. For details about the inheritance relationship of each ability, see [Inheritance Relationship](./js-apis-app-ability-ability.md#ability-inheritance-relationship).
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5> **NOTE**
6>
7> The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.
8>
9> The APIs of this module can be used only in the stage model.
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11## Modules to Import
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13```ts
14import { ExtensionAbility } from '@kit.AbilityKit';
15```
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17**Atomic service API**: This API can be used in atomic services since API version 11.
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19**System capability**: SystemCapability.Ability.AbilityRuntime.AbilityCore
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