X3D is an open standard for 3D computer graphics that allows for the representation and interchange of 3D models and scenes. It is designed to be used on the web and supports various features like animations, interactivity, and complex visual effects. X3D files are typically written in XML format, making them easy to read and edit. The X3D specification is maintained by the Web3D Consortium, which aims to promote the use of 3D graphics on the internet. This technology is widely used in applications such as virtual reality, simulations, and educational tools, enhancing user experiences through immersive environments.