Definition: A terabyte (TB) is a unit of data storage equal to 1,000,000,000,000 bytes. It is a very large multiple of the byte, used for enormous storage capacities.

History/origin: Similar to other byte multiples, the terabyte uses the SI prefix 'tera' to represent one trillion. Its use became essential as storage devices reached unprecedented capacities.

Current use: Terabytes are now commonly used to describe the capacities of large hard drives, solid-state drives (SSDs), and network storage devices. Databases, cloud storage, and media archives are also often measured in terabytes.