Sometimes, you don't have direct access to the Raspberry Pi running your project. Perhaps it's installed outdoors with no display and keyboard attached. Or maybe it was squeezed into a compact chassis ...
If you own a Raspberry Pi, you can start several operating systems from a single boot medium. All you need is a micro SD card ...
The Raspberry Pi finds a use in a huge variety of applications, and in almost any location you could imagine. Sadly those who use those machines might not be in the same place as the machines ...