SCSI (Small Computer System Interface) was used to physically connect two computers to peripheral devices and transfer data between them. SCSI was used to connect hard disk drives, tape drives, scanners, CD drives, and other devices. SCSI is pronounced “scuzzy.”
I remember using an Apple SCSI System Cable to connect external Apple CD-ROM drives, scanners, and hard drives. The thickness of the cable made it difficult to bend and contributed to a high failure rate.