Plug-in, plug in or plugin may refer to:
- Plug-in (computing) is a software component that adds a specific feature to an existing computer program.
- Audio plug-in, adds audio signal processing features
- Photoshop plugin, a piece of software that enhances the functionality of Adobe Photoshop
- Plug-in electric vehicle, type of electric vehicle
- Plug-in hybrid, a type of plug-in electric vehicle
- Glade PlugIns, fragrance distribution product
- Plug Ins, chain of electronics stores owned by Al-Futtaim Group
People with the surname
- Vladimir Plugin (1937–2003), Russian historian and art historian
See also
- AC power plugs and sockets, two- or three-pronged wall electrical outlets
- Add-on (disambiguation)
- Browser extension, which modifies the interface and/or behaviour of web browsers
- Change of variables, a mathematical procedure wherein substitutions are made in a formula
- Plug and play, a common standard for hardware equipment installation