Secondary storage refers to non-volatile storage devices that retain data even when the power is turned off. Unlike primary storage, such as RAM, which is fast but temporary, secondary storage provides a larger capacity for storing files, applications, and system data. Common examples include hard disk drives (HDD), solid-state drives (SSD), and USB flash drives. These storage solutions are essential for long-term data retention and backup. They allow users to save important information, such as documents, photos, and software, ensuring that it can be accessed later. Secondary storage is crucial for both personal and business computing needs.