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Add-on may refer to:


  • 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, a usually commercially distributed add-on for a video game (usually extended story line, new game areas or objects)
    • Downloadable content, an add-on for a video game which is distributed commercially through the Internet by the game's official publisher


  • Peripheral, an optional computer hardware component that significantly 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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