what is d3js

D3.js (short for Data-Driven Documents) is a JavaScript library that allows users to create interactive data visualizations in web browsers. It was created by Mike Bostock in 2011 and has since become one of the most popular data visualization libraries available.

D3.js is designed to work with data and is especially useful for creating data-driven visualizations. It provides a variety of tools for data manipulation, such as filtering, sorting, and grouping, as well as a wide range of chart types, including bar charts, line charts, scatterplots, and more.

D3.js is an open-source library and can be used for free under the terms of the BSD license. It is compatible with modern web browsers and can be used in conjunction with other web technologies such as HTML, CSS, and SVG. Because it is a JavaScript library, D3.js can be used to create dynamic and interactive visualizations that respond to user input and changes in the underlying data.