SAS may refer to any of the following:
1. Short for Serial Attached SCSI (small computer system interface), SAS is a serial transmission replacement for the parallel SCSI. SAS is an improvement of traditional SCSI that supports a maximum of 128 simultaneous devices at transmission speeds of 3.0 Gb/s. SAS devices also have two data ports and can communicate with both SCSI and SATA (Serial AT Attachment).
2. Short for Standalone Server, SAS is a server that does not rely on any other servers or services.