A portable hard drive is a compact storage device that allows users to save and transfer large amounts of data easily. It connects to computers and other devices via USB or other interfaces, making it convenient for backing up files, photos, and videos. These drives come in various capacities, typically ranging from hundreds of gigabytes to several terabytes. Portable hard drives are popular among students, professionals, and anyone needing extra storage on the go. They are often used in conjunction with laptops, desktops, and gaming consoles to expand storage options and ensure data is accessible wherever needed.