Glassmorphism is a visual style that makes parts of an interface look like frosted glass. Panels are partly transparent and may blur what sits behind them, while their edges and shadows help them stand out.
Imagine a translucent card floating over a colored background. It can create a layered, light feeling when used for a menu or a small information panel.
The effect can make words difficult to read if the background is busy or the contrast is weak. Use it sparingly and check that the text stays clear; the decoration should never get in the way of the information.