X3 is a term that can refer to various concepts, but it is often associated with the X3D file format used for 3D graphics. This format allows for the representation of 3D models and scenes in a way that can be easily shared and rendered in web browsers. It supports various features like animations, textures, and interactivity, making it suitable for applications in gaming, virtual reality, and simulations. In another context, X3 may refer to the X3 series of video games, which are popular space simulation games developed by Egosoft. Players can explore vast universes, engage in trade, and participate in combat, all while managing their own space fleets and economies. The series is known for its depth and complexity, appealing to fans of strategy and exploration.