From Wikipedia, the free encyclopedia


  • Plug-in (computing), a piece of software which enhances another software application and usually cannot be run independently.
    • Browser extension, which modifies the interface and/or behavior of web browsers
    • Add-on (Mozilla), a piece of software that enhances and customizes Mozilla-based applications
  • Expansion pack, an add-on for a video game


  • Peripheral, an optional computer hardware component that supplements or enhances the functionality of the original unit
  • Video game accessory, a piece of hardware used in conjunction with a video game console for playing video games


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