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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)
1.
being or able to be added on - an add–on device
2.
able to be added to - add–on certificates of deposit
add-on

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).

Add-on
Definition of "Add-on" by Chat GPT: An add-on is a software extension or a program that enhances the capabilities or functionality of an existing software application. Add-ons can add new features, tools, or functionalities to an application, or modify and improve its existing features. Add-ons are typically designed to integrate with the main software application and offer additional value to the user. Examples of add-ons include browser extensions, plugins, themes, and modules for various software applications.
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