Data storage devices are hardware components used to save and retrieve digital information. Common types include hard disk drives (HDD), solid-state drives (SSD), and USB flash drives. These devices vary in speed, capacity, and durability, making them suitable for different applications, from personal use to enterprise-level data management. Data storage devices can be categorized into primary and secondary storage. Primary storage refers to temporary storage like RAM, which is fast but volatile, while secondary storage includes permanent solutions like CDs, DVDs, and cloud storage. Each type plays a crucial role in how we manage and access data.