A SATA HDD (Serial ATA Hard Disk Drive) is a type of storage device commonly used in computers and servers. It uses the Serial ATA interface to connect to the motherboard, which allows for faster data transfer rates compared to older parallel ATA (PATA) drives. SATA HDDs are known for their high storage capacities, making them ideal for storing large amounts of data such as operating systems, applications, and multimedia files. They are typically more affordable than solid-state drives (SSDs), though they have slower read and write speeds due to their mechanical nature. SATA HDDs are widely used for their reliability and cost-effectiveness in both consumer and enterprise environments.