Definition, synonyms and related words
Alternative spelling of plug-in
In plain English: A plugin is a small piece of software you add to an existing program to give it new features.
"I need to check if my phone charger is still plugged into the wall socket before I leave for work."
Usage: Use "plugin" as a noun to refer to a hardware device or software module that connects to a larger system to add functionality. It functions identically to the hyphenated form "plug-in," though the single-word version is increasingly common in modern computing contexts.
Derived from English, this term combines the prefix "plug-" with "-in" to mean something inserted into an opening or socket. It originally referred to electrical connectors before expanding to describe software modules added to existing programs.