YUMI (Your Universal Multiboot Installer) is a free and portable software that allows users to create a multiboot USB drive containing multiple operating systems, antivirus utilities, diagnostic tools, and other bootable ISOs. The software supports more than 50 different operating systems, including Windows, Linux, and macOS, and allows users to add or remove ISOs at any time. Additionally, YUMI offers a persistence feature that enables users to save changes and settings across reboots, making it a useful tool for system administrators, technicians, and enthusiasts.