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Merriam-Webster Online Dictionary
add-on (noun)
something added on as
a) a sum or amount added on
b) something (as an accessory or added feature) that enhances the thing it is added to - computer hardware add–ons
add-on (adjective)
being or able to be added on - an add–on device
able to be added to - add–on certificates of deposit

In computing, a plug-in (or plugin, add-in, addin, add-on, or addon) is a software component that adds a specific feature to an existing computer program. When a program supports plug-ins, it enables customization.

Mozilla Firefox displaying a list of installed plug-ins

A theme or skin is a preset package containing additional or changed graphical appearance details, achieved by the use of a graphical user interface (GUI) that can be applied to specific software and websites to suit the purpose, topic, or tastes of different users to customize the look and feel of a piece of computer software or an operating system front-end GUI (and window managers).

Definition of "Add-on" by Chat GPT: An "add-on" refers to a software component or feature that can be added to an existing software program to enhance its functionality or provide additional capabilities. Add-ons are typically designed to be optional and can be installed or removed as needed by the user.
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