add-ins

Definition

Software plug-ins that extend the functionality of a larger application, like giving your Excel spreadsheet superpowers it never asked for. These little code parasites attach themselves to host programs to add features, automate tasks, or generally make your life easier—or introduce delightful new bugs. Think of them as the remora fish of the software world, hanging onto bigger programs for mutual benefit.

Example Usage

I spent three hours debugging only to discover one of my Excel add-ins was the culprit all along.

Source: Common software terminology

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