A bootable USB is a portable storage device designed to start a computer and run an operating system or utility software directly from the USB drive. It is commonly used for installing or repairing operating systems, running diagnostics, recovering lost data, or accessing a system when the internal drive is not working. Compact and easy to use, a bootable USB offers fast boot times, broad compatibility with most PCs and laptops, and the convenience of carrying essential tools in your pocket, making it an essential solution for IT professionals, technicians, and everyday users alike.