MIUI 12.5 is an Android-based custom operating system used by Xiaomi on its smartphones, and it was released in early 2021. Some of the new features and improvements that were introduced in MIUI 12.5 include:

Faster Performance - MIUI 12.5 has been optimized to make Xiaomi smartphones run faster and smoother. Xiaomi claims that MIUI 12.5 is up to 20% faster than its predecessor, MIUI 12.

Reduced System Apps - MIUI 12.5 reduces the number of pre-installed system apps on Xiaomi smartphones, making them lighter and faster.

New Super Wallpaper - MIUI 12.5 comes with a new super wallpaper that features high-resolution animated images of Earth and Mars. These wallpapers change dynamically based on the time of day, creating a unique and immersive visual experience.

New Privacy Features - MIUI 12.5 includes enhanced privacy features, including a new "sandbox" feature that isolates apps from the rest of the system to prevent data leakage. There are also new options for managing app permissions and location tracking.

New Notification Shade - The notification shade in MIUI 12.5 has been redesigned to make it easier to read and more intuitive to use. It includes new options for customizing notifications and accessing quick settings.

Updated Notes App - The Notes app in MIUI 12.5 has been updated with new features, including the ability to create task lists and a new "drawing mode" that allows users to sketch out ideas and drawings.

New Sound Effects - MIUI 12.5 comes with new sound effects that have been optimized for a better audio experience. These include new ringtones, notification sounds, and system sounds.

Overall, MIUI 12.5 brings several new features and improvements that enhance the performance, privacy, and user experience of Xiaomi smartphones.