Glassmorphism is a contemporary UI design trend characterized by the use of transparency and background blur to create a glass-like effect, often enhanced with vivid backgrounds for a visually striking appearance. This design style, popularized in late 2021 by Michal Malewicz, who also introduced Neumorphism, has been adopted by major tech companies like Apple and Microsoft, evident in their operating system interfaces. The technique involves layering translucent elements to add depth and dimension, creating an immersive user experience. Key properties used in CSS to achieve Glassmorphism include opacity, backdrop-filter for the blur effect, and additional styling like shadows and borders to delineate elements. The trend, though reminiscent of the transparent menus of iOS 7 and Windows Vista, has regained popularity with the advent of CSS support for backdrop-filter, encouraging its application in web design. Glassmorphism is applied across various platforms, from mobile and desktop apps to operating system UIs and websites, and is complemented by tools like Glass UI generators that aid in its implementation.