YUI (Yahoo User Interface Library)

The Yahoo User Interface (YUI) Library is a collection of pre-written code tools that web developers can use to make building websites easier and faster. It provides ready-to-use features like dynamic menus, sliders, and animations, helping websites look modern and work smoothly without starting from scratch. Essentially, YUI helps developers add complex, interactive elements to websites efficiently, ensuring consistency and reducing development time. Although less common today, it was a popular resource for creating rich, user-friendly web pages in the past.