This document discusses using Web APIs, specifically the Google Chart API, to generate charts and graphs. It provides: 1) An overview of what a Web API is and how it can be used to access functionality from another application over HTTP. 2) A description of the Google Chart API and how it can be used to generate charts as PNG images by specifying parameters in a URL. 3) Details on common parameters for the Google Chart API including how to specify chart size, data, type, and colors.