SCSI (pronounced "skuzzy") is a standard interface used to connect external peripherals, such as hard drives, scanners, and other devices, to a computer. Most SCSI setups allow multiple devices-typically up to seven-to be connected in a single chain, with each device assigned a unique ID number for proper communication.
While SCSI was once widely used in professional photography and digital imaging setups for connecting high-speed storage and scanning equipment, it is gradually being replaced by faster and more user-friendly interfaces such as USB and FireWire. Understanding SCSI is still useful for working with legacy equipment or specialised workflows in imaging and media production.