Final answer:
Secondary storage, also known as auxiliary or external storage, is used to retain data long-term on devices such as HDDs, SSDs, and USB drives.
Step-by-step explanation:
Secondary storage is often referred to by another name: auxiliary storage or external storage. This type of storage is used for keeping data on a long-term basis, as opposed to primary storage, which is accessed directly by the computer's CPU.
Secondary storage devices include hard disk drives (HDDs), solid-state drives (SSDs), USB flash drives, CDs, and DVDs, among others. These devices are non-volatile, meaning they retain data even when the computer is turned off. Secondary storage is essential for data backup, archiving, and keeping large amounts of data that do not fit into primary storage.