The document provides an overview of various widgets available in Google Web Toolkit (GWT) for building user interfaces. It discusses static widgets like Label and Image, form widgets like Button, Checkbox and TextBox, and complex widgets like ListBox and SuggestBox. Code samples are given to demonstrate how to create and style these widgets using Java and Cascading Style Sheets (CSS). The document also explains concepts like event handling in GWT and working with the entry point class.