The **Promise Polyfill** is a tiny (≈ 1 KB gzipped) library that adds full‑ES6‑compatible `Promise` behavior to browsers and Node environments that lack native support, making asynchronous code easier to write and reason about. It’s intended for developers who need to support older browsers (IE 8+) or other non‑standard JavaScript runtimes while still using modern promise syntax and APIs. The polyfill can be used globally to patch the environment or imported as a module without affecting the surrounding code, giving both application and library authors a lightweight solution for predictable, spec‑compliant promise handling.