SAS Controllers are specialized hardware components that manage the communication between a computer's central processing unit (CPU) and its storage devices using the Serial Attached SCSI (SAS) protocol. They facilitate data transfer between the system and storage drives, ensuring efficient and reliable performance. SAS controllers can connect multiple drives, allowing for increased storage capacity and redundancy. These controllers are commonly used in enterprise environments where high-speed data access and reliability are crucial. They support features like data redundancy and hot swapping, enabling users to replace drives without shutting down the system. This makes them ideal for servers and data centers.