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The programming language that runs in browsers and powers most modern web apps.
JavaScript makes pages interactive: clicks, forms, menus, fetch calls, animations, and client-side state. It also runs on servers through Node.js. If HTML is structure and CSS is presentation, JavaScript is behavior.
Plainly
Think of JavaScript as a named building block in a big LEGO app. The programming language that runs in browsers and powers most modern web apps.
In practice
Use it when you are mapping how the app is structured or explaining a feature to a teammate or agent. In practice, define the owner, input, output, and failure mode before you rely on it.