Chart.js
Chart.js is an open-source JavaScript library for creating responsive, interactive, and customizable charts on web pages. It uses HTML5 Canvas to render various chart types like line, bar, pie, and radar charts, with built-in animations and tooltips. It is lightweight, easy to integrate, and widely used for data visualization in web applications.
Developers should learn Chart.js when building web applications that require simple to moderately complex data visualizations, such as dashboards, analytics tools, or reports. It is ideal for projects needing quick implementation without heavy dependencies, as it works with vanilla JavaScript and popular frameworks like React or Vue. Use it for real-time data updates, mobile-friendly charts, or when a free, community-supported solution is preferred over commercial alternatives.