Apple's new and sweeping user interface design is called 'Liquid Glass'
All of Apple's operating systems have received a redesigned user interface called "Liquid Glass," featuring translucent elements with rounded corners, and an all-around new look.

Apple has unveiled its new Liquid Glass design language at WWDC.
On June 9, at Apple's annual Worldwide Developers' Conference, the iPhone maker unveiled a series of design changes that have been implemented across all software platforms.
The company's goal was the creation of a unified design language that would lead to a harmonious experience when moving between different Apple products. The new design is available on iOS 26, iPadOS 26, macOS Tahoe 26, watchOS 26, and even tvOS 26.
The operating systems now have a similar look across the board, with a glass-like aesthetic inspired by visionOS. Apple's new "Liquid Glass" material behaves like real-world glass, particularly in the way that it refracts light and reacts to movement dynamically with specular highlights. Apple says it uses real-time rendering to achieve these effects
It adjusts based on the content you're watching, making it somewhat reminiscent of the blur effects introduced with iOS 7. The new material extends to various user interface elements, including buttons, switches, and more.
Liquid Glass is used across new dynamic operating system elements that adjust according to the user's needs, allowing for a more intuitive experience. This means that tab bars can shrink and expand as needed. User interface elements designed for rectangular displays have now now feature rounded corners, much like Apple's more recent hardware releases.

Apple's Liquid Glass material is visible across iOS 26. Image Credit: Apple.
The new Liquid Glass design language extends to the entirety of Apple's operating systems, including the Control Center, Lock Screen, Notification Center, Lock Screen, and widgets. iOS 26 features new Home Screen icons that were made using multiple layers of Liquid Glass, and there's even a new Clear look, in addition to the existing Light and Dark modes.
The Clear look is available on macOS Tahoe as well, making it so that both the Dock, its apps, and the Menu Bar all become transparent. This makes the display appear larger, according to Apple. On iOS, the Lock Screen clock now uses the same Liquid Glass material and it adapts to the image chosen by the user. The clock shrinks and expands as needed.

Apple has made some elements dynamic, with rounded corners. Image Credit: Apple.
Developers will also have access to an updated set of APIs, which will allow them to use the new Liquid Glass design for their own applications.
Apple says the new design blurs the lines between hardware and software, and explains that Liquid Glass was made through the close collaboration of the company's hardware and software development teams. Apple called the new material its "broadest design update ever."
Still, the redesigned user interface looks and feels familiar, and is a far cry from the circular app icons that were rumored ahead of WWDC.
Read on AppleInsider
Comments
It's clear their design is a bit of a distraction tactic from it. Haven't we seen this UI design before? It actually feels like a step back in time to me.
On the positive side, they really seem to have fixed iPadOS - finally.
With iOS 7, the heavy transparency was awful because everything blended over itself and over the next few iOS updates, the transparency was significantly reduced so you could actually see what you were doing without elements from behind bleeding into everything else. I imagine the same will occur again. The screenshot above showing the Home Screen looks just like iOS 18, with a few minor tweaks to the icons. Not that much of a change. Not exactly a 'radical' design change as all the websites claimed.
I am not going to weigh in on whether liquid glass works for me until I get some time with it and it’s reached release quality.
"No, I already know I don't like it," said petulant child.
GTFU people, good god.