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Denotes questions regarding Magento custom attributes

Denotes questions regarding Magento custom attributes which are those added on behalf of a merchant. For example, a merchant might need to add attributes to describe products, such as shape or volume. A merchant can add these attributes on the admin panel, and these attributes can be displayed.

Extension attributes in Magento 2 are used to extend functionality and often use more complex data types than custom attributes. These attributes do not appear on the GUI.

Official documentation:

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