Serial Attached SCSI (SAS) is a point-to-point serial protocol used to connect storage devices like hard drives and solid-state drives in servers and data centers. It offers high data transfer rates, improved reliability, and the ability to connect multiple devices through a single cable, making it ideal for enterprise environments. SAS supports advanced features such as multipathing and hot swapping, allowing for better performance and easier maintenance. It is often used in conjunction with SATA drives, providing a flexible storage solution that balances speed and capacity for various applications.