jPlayer is a free, open-source media library written in JavaScript that enables developers to integrate audio and video into web pages. Utilizing HTML5, jPlayer ensures compatibility across modern browsers and provides a consistent user experience. For older browsers, it gracefully falls back to Adobe Flash as needed. jPlayer is highly customizable, supporting a wide range of media formats, and is extendable through its plugin architecture, allowing for enhanced functionality. It is designed for ease of use and integrates seamlessly into web projects, making it an ideal choice for developers looking to add robust media features to their sites.