D3.js (D3 for Data-Driven Documents) is a JavaScript library for producing dynamic, interactive data visualizations in web browsers. Developed by Mike Bostock
License: Open Source
D3.js is a powerful and flexible JavaScript library for creating complex and highly customized visualizations, making it ideal for developers with programming experience. In contrast, Google Charts is more user-friendly and provides a quick way to create standard charts without extensive coding, making it suitable for users looking for simplicity and efficiency.