add-on (Q117670709)
discrete product or component that attaches to or works with a main item to extend its functionality
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other details
aliases supplement
 addon
 extension
 expansion
 attachment
 add-on product
 add-in
 plug-in product
 accessory
description discrete product or component that attaches to or works with a main item to extend its functionality

External Links
(P12093) Add-on