A USB 3.0 to SATA adapter allows you to connect a SATA hard drive or SSD to a computer via a USB 3.0 port. This enables you to use the SATA drive as an external storage device, for data transfer, or as a boot drive. These adapters typically support data transfer speeds of up to 5Gbps (USB 3.0) and some may also support UASP for even faster speeds.