---
schema_version: "1"
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title: Inheritance Rules
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---

# Inheritance Rules

This table describes the inheritance rules for various elements.

|Element|extends|implements|Default Base Element|
|-------|-------|----------|--------------------|
|**component**|one extensible component|multiple interfaces|`<aura:component>`|
|**app**|one extensible app|N/A|`<aura:application>`|
|**interface**|multiple interfaces using a comma-separated list (`extends="ns:intf1,ns:int2"`)|N/A|N/A|

**See Also**  


-   [Interfaces](https://developer.salesforce.com/docs/platform/aura-platform/guide/oo-interfaces.md)