# Attribute Access Control

The `access` attribute on the `aura:attribute` tag controls whether the attribute can be used outside of the attribute’s namespace.

Possible values are listed below.

| Access    | Description                                                                                                                                                                                                                                                                                                                                                   |
| --------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `private` | Available within the component, app, interface, or event, or method and can’t be referenced outside the resource. Accessing a private attribute returns `undefined` unless you reference it from the component in which it’s declared. You can’t access a private attribute from a sub-component that extends the component containing the private attribute. |
| `public`  | Available within your org only. This is the default access value.                                                                                                                                                                                                                                                                                             |
| `global`  | Available in all orgs.                                                                                                                                                                                                                                                                                                                                        |