An external hard drive is a storage device that plugs into a computer to provide extra space for files. It is used outside the computer and can be easily connected or disconnected. External hard drives are commonly used to back up data, move files between computers, and store large amounts of information. Some external drives use spinning disks (hard disk drives, HDDs), while others use solid-state memory (solid-state drives, SSDs). They typically connect using USB, USB-C, Thunderbolt, or eSATA.
