Glossary
Liquid Glass
Apple's translucent, native design material introduced with the macOS 26 generation.
Liquid Glass is Apple's design language for the system generation that includes macOS 26: translucent materials, controls that sit on a glass-like surface, and a look apps can adopt instead of drawing their own chrome. It is a visual system. It is not a privacy policy and not a file-system feature.
Our macOS 26 apps use that native material, so their windows and menu bar items look like the Mac they appear on. What an app does, such as a preview before a change or data that stays on the Mac, is independent of the material. More on that split is in Liquid Glass on a Mac utility.