`babel-standalone` provides a pre‑bundled version of Babel that runs entirely in the browser (or any non‑Node environment). It lets developers transform ES2015+/JSX code on‑the‑fly—e.g., in REPLs, online editors, or apps that embed a JS engine—by loading a single script (`babel.min.js`) and using the `Babel` API or `<script type="text/babel">` tags. It’s aimed at web developers and tool makers who need real‑time transpilation without a build step.