YUMI (Your Universal Multiboot Installer) is a free and user-friendly software that allows users to create a multiboot USB flash drive containing multiple operating systems, antivirus utilities, and other tools. Its most important feature is the ability to add multiple ISO files to a single USB drive, making it a portable and versatile tool for system administrators, technicians, and power users. YUMI also supports persistent storage, allowing users to save their data and settings across reboots, and offers a simple and intuitive interface with step-by-step instructions.