raf-pool is a JavaScript library that optimizes memory usage by managing requestAnimationFrame calls through a single pool, reducing the overhead of multiple recurring handles on the main thread. It is designed for developers working on web applications with numerous animations or elements that require requestAnimationFrame, such as those using ember-in-viewport or ember-infinity. By using raf-pool, developers can significantly improve performance and memory efficiency, especially when dealing with hundreds of images or animations on a page.