Learning D3.JS 5.0 4.2: What Is Data?

The video tutorial introduces the concept of data, explaining that it can be various forms such as images, audio, text, and video. It then narrows down to data in D3.js, which can be text or numbers, and discusses four sources of data: hardcoded data, TXT files, JSON files, and CSV files. The tutorial emphasizes the importance of combining data with visual elements using HTML and CSS for effective data visualization, specifically using the D3.js library. The video concludes with a preview of upcoming topics, focusing on making elements appear on the page in D3 style and covering select methods.

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