拡かく張ちょう機き能のう

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Meanings

1

In software, a module that adds new features to an existing program. Often used for browser extensions, IDE plugins, and similar add-ons.

プラグイン
プラグイン is a more general loanword for software add-ons, while 拡張機能 specifically emphasizes added functionality and is common in official documentation.
アドオン
アドオン is a direct loanword for add-on, often used interchangeably with 拡張機能, but 拡張機能 sounds more technical and formal.

Compound of 拡張 (expansion) and 機能 (functionality). A modern technical term with no special historical derivation.