This document provides an overview of D3.js, a JavaScript library for visualizing data in web browsers. It was created in 2011 by Mike Bostock and uses HTML, SVG, and CSS standards to bind interactive graphics to web page documents. D3.js has a steep learning curve but is well-suited for creating interactive and dynamic data visualizations on the web that can adapt to different devices in real-time. It works by joining data to graphical elements using enter, update, and exit operations and provides layouts to organize nodes and edges in network graphs.