CAT4D is a cutting-edge technology that generates 4D scenes from monocular videos using multi-view video diffusion models. It transforms input monocular videos into multi-perspective video and reconstructs dynamic 3D scenes. The significance of this technology lies in its ability to extract and reconstruct complete spatial and temporal information from single-view video footage, providing robust technical support for virtual reality, augmented reality, and 3D modeling. Background information indicates that CAT4D is a collaborative project developed by researchers from Google DeepMind, Columbia University, and UC San Diego, representing a successful case of turning advanced research outcomes into practical applications.