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In this short French-language instructional video, the narrator explains the primary purpose of JavaScript when used on the client side: to create interactivity between a web page and its user. Interactivity is defined as the ability of a page to detect user actions and execute the desired processing, allowing a two-way dialogue between the browser and the user. While acknowledging that interactivity can be broader, the speaker emphasizes that any page capable of recognizing user input and responding is considered interactive, and JavaScript is the tool that enables this behavior.










