A Raspberry Pi multiboot lets you pick Raspberry Pi OS, Ubuntu, or MX Linux at startup without changing SD cards.
Raspberry Pi and other SBCs can boot an operating system from SD cards and USB devices. I own multiple SD cards and am a fan of swapping them to instantly switch to a different OS, such as RetroPie, ...
If you've been using SD cards for years, you probably have old ones lying around with low storage and not much use. This ...