For the term plug-in, see
- Plug-in (computing) In computing, a plug-in consists of a computer program that interacts with a host application (a web browser or an email client, for example) to provide a certain, usually very specific, function "on demand". Applications support plugins for many reasons. Some of the main reasons include:, an auxiliary computer program
- Plug-in hybrid A plug-in hybrid electric vehicle is a hybrid vehicle with batteries that can be recharged by connecting a plug to an electric power source. It shares the characteristics of both traditional hybrid electric vehicles, having an electric motor and a internal combustion engine, and of battery electric vehicles, also having a plug to connect to the electric vehicle
- Plugging in (algebra), a mathematical procedure in which substitutions are made in a formula
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