Learning D3.JS 5.0 1.3: What Is D3.js?

The video introduces D3.js, a JavaScript library for data visualization using web standards. It emphasizes the importance of data-driven visualizations and provides steps to create effective diagrams. Examples of good and bad visualizations are discussed, highlighting the role of color and size. The video concludes with a preview of the next steps, including downloading a text editor for further learning.

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