USB Mass Storage is a technology that allows external devices, like USB flash drives and external hard drives, to connect to computers and transfer data. It uses the Universal Serial Bus (USB) interface, which is a standard for connecting various devices. This technology enables users to easily store, retrieve, and manage files across different systems. When a USB mass storage device is plugged into a computer, it is recognized as a removable drive. Users can drag and drop files, making it simple to back up important data or share files between devices. This convenience has made USB mass storage a popular choice for personal and professional use.