It provides at-a-glance information. You can quickly see if your Wi-Fi is connected, how much battery life remains on your laptop, or if your backup is currently syncing.
Over time, the system tray can become "cluttered," with too many icons competing for space. Modern operating systems offer ways to keep it organized: systemtray
Designing a System Tray App: UX & Code Guidelines It provides at-a-glance information
The concept of the system tray was popularized by Windows 95 and has since become a staple of GUI (Graphical User Interface) design across almost all platforms. macOS has its (top right), and Linux distributions use various Status Notifiers . Even mobile devices have adopted a version of this via the status bar at the top of the screen. Modern operating systems offer ways to keep it
: A small image (typically 16x16 or 32x32 pixels) that represents your application in the notification area.