SCSI, or Small Computer System Interface, is a set of standards used for connecting and transferring data between computers and peripheral devices. It allows multiple devices, such as hard drives, printers, and scanners, to communicate with a computer through a single interface. SCSI supports various data transfer rates and can connect up to 15 devices on a single bus. Originally developed in the 1980s, SCSI has evolved over time, with different versions offering improved performance and capabilities. It is commonly used in servers and high-performance workstations, providing reliable and efficient data management for various applications.