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External drives refer to portable storage devices that can be connected to computers and other electronic devices to expand their data capacity. They are designed to provide additional storage space beyond the built-in storage of a device, allowing users to store, transfer, and backup large files and data. External drives come in various forms, including hard disk drives (HDDs), solid-state drives (SSDs), and hybrid drives, each with its unique features and benefits. They can be connected to devices using different interfaces, such as USB, FireWire, or Thunderbolt, providing fast data transfer rates and reliable performance. External drives are an essential accessory for computers, servers, edge computers, and other electronic devices that require additional storage space, making them a popular choice among professionals, businesses, and individuals alike.