This document defines widgets and discusses their uses. It explains that widgets are web-based applications that can be embedded on web pages, desktops, or operating systems. There are two main types - web widgets which run inside web pages, and desktop widgets which are mini-applications on the desktop. Widgets are used to distribute information, integrate and present data, and communicate with others. They allow content sharing and are relevant as they make content portable across different devices. The document also discusses how to measure a widget's success and provides best practices for using widgets.