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 manage large amounts of data efficiently. Disk arrays can be configured in different ways, such as RAID (Redundant Array of Independent Disks), which enhances data protection and speed. They are essential for businesses that require reliable and fast access to their data, making them a critical component in modern computing environments.