jQuery - Fast, Small, Feature-Rich JavaScript Library

jQuery is a venerable, fast, and feature-rich JavaScript library primarily designed for client-side HTML DOM traversal and manipulation, event handling, animation, and Ajax. The current stable version is 4.0.0, released in January 2026, following a multi-year development cycle for major versions, with minor patches and bug fixes occurring more frequently. It differentiates itself by providing a concise, cross-browser API, simplifying common web development tasks that were historically complex due to browser inconsistencies. While newer browser APIs have reduced its necessity for some tasks, it remains a widely used tool for projects requiring broad browser compatibility or leveraging its extensive plugin ecosystem.