A disk array is a storage system that combines multiple hard drives or solid-state drives into a single unit. This setup improves data redundancy, performance, and storage capacity. Disk arrays are commonly used in servers and data centers to ensure that data is safe and accessible, even if one or more drives fail. Disk arrays can be configured in different ways, such as RAID (Redundant Array of Independent Disks), which offers various levels of data protection and speed. They are essential for businesses that require reliable and efficient data storage solutions, making them a critical component of modern computing infrastructure.