What it is
IGEL OS is a lean Linux that runs on the endpoint and stores nothing permanently. After every restart the machine is back in its defined state. Configuration comes from a central management server rather than from the device.
What it is for
Workplaces whose real environment runs somewhere else: virtual desktops, published applications, web applications. The device becomes an access point and stops being a computer that needs maintaining.
The second use case is extending life. Hardware too weak for a current Windows is still perfectly adequate for this.
What to watch
Anything that has to run locally will not run here. Peripherals are the usual obstacle, particularly specialist equipment in labs, on production lines and in medical practices. That inventory belongs at the start of the project, not in the pilot.