Software
- 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
Hardware
- 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
Other
- An extension to a house
- Addon, a person named in the Hebrew bible
- An adjuvant therapy, an add-on therapy to existing treatment
See also
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