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, ...
Balena’s Etcher software is a free, cross-platform tool for Windows, Mac, or Linux that makes it easy to flash an OS image to a bootable SD card or USB flash drive. You can use it to load an operating ...
The Raspberry Pi Imager tool has been released. The tool makes it very simple to grab the latest Raspberry Pi operating systems and write them to an SD card. The simple UI makes it ideal for novices.