PopperJS - a small (3KB) JavaScript library for creating popovers, or 'bubbles above an object'

Popper.js is an incredibly useful library that focuses on positioning elements on web pages. Its main goal is to enhance user experience by ensuring that dropdowns, tooltips, and other interface elements are positioned correctly. The integration of Popper.js with popular frameworks like Bootstrap makes it even more valuable for developers. This technology allows for dynamic adjustment of elements based on the viewport, which is vital for responsive web applications. It's worth noting that Popper.js is written in JavaScript, making it easy to integrate into various web projects.