Liquid Glass is a visual design effect introduced by Apple that adds translucent, frosted-glass-like backgrounds to app windows and interfaces. This effect allows elements behind a window to subtly show through, creating a sense of depth and layering while maintaining readability and focus. Liquid Glass is used to enhance user experience by making digital environments feel more dynamic, elegant, and visually appealing. It is commonly seen in macOS and iOS, where it helps unify the look of apps and system components without distracting from content.