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PixiJS is a popular open-source JavaScript rendering engine that aims to provide a fast, lightweight, and flexible solution for creating interactive 2D graphics and animations in web browsers. It utilizes the WebGL API for hardware-accelerated rendering, which allows for significantly improved performance compared to traditional DOM manipulation or the HTML5 Canvas API, especially for complex scenes with many objects or effects. When WebGL is not available, PixiJS gracefully falls back to a Canvas renderer.

The engine is designed to be easy to use for developers, abstracting away much of the complexity of WebGL. It provides a scene graph system, making it straightforward to organize and manage visual elements. PixiJS supports a wide range of features including sprites, text, particle emitters, filters, and advanced rendering techniques. Its extensibility allows developers to create custom shaders and integrate with other libraries. PixiJS is widely used in the development of games, interactive visualizations, educational tools, and other web-based applications that require high-performance 2D graphics. The project is actively maintained and has a large community contributing to its development and support.