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USDZ is a zero-compression ZIP archive containing a USD (Universal Scene Description) file and its associated textures, all in a single package. Apple adopted it as the format for AR Quick Look on iOS — tap a USDZ link on your iPhone and a 3D model appears on your desk, your floor, or floating in mid-air.
The format bundles a USD scene graph with PNG or JPEG textures into an uncompressed archive that can be memory-mapped for fast loading. Apple added its own MaterialX-based material schema (UsdPreviewSurface) to ensure consistent rendering across devices. The spec requires that the first file in the archive be the root USD layer — parsers can start reading geometry before the entire archive is downloaded.
USDZ is primarily an Apple ecosystem format. iOS Safari, Messages, Mail, and AR Quick Look all handle it natively. E-commerce sites use USDZ to let customers preview furniture, shoes, or electronics in AR before buying. Adobe, Pixar, and Apple maintain the tooling, but outside Apple's walled garden, glTF/GLB is more widely supported.