The OS Distribution widget shows you which operating systems the devices in your environment use and how they are distributed across all devices. The inner circle of the chart represents the OS type, and the outer circle represents the OS version. This information lets you know where to focus your efforts.
For example, you notice that a few devices use an operating system that you know is no longer supported. You can drill down to get a list of these devices. Then you can upgrade the devices to protect them from any vulnerabilities that are specific to the unpatched OS.