Convert x to usd

What is the difference between .x and .usd?

Description: X is a DirectX Model image file used by DirectX technology which is for 3D graphics rendering in games. The file format specifies 3D object structures for meshes, textures, animations, and objects.; USD is a file format used for 3D models and scenes. It is an open-source format developed by Pixar, and it is designed to be used in combination with their Universal Scene Description (USD) technology. USD files store 3D geometry, materials, lighting, and other scene data, and they can be used to exchange 3D content between different 3D applications and pipelines.