仓库 (cāngkù) is a compound noun meaning 'warehouse' — a large building or space used for storing goods, raw materials, or inventory before they are distributed, sold, or used. The character 仓 (cāng) originally meant 'granary' or 'storage place', often associated with grain storage in ancient China; it conveys the idea of safekeeping and containment. The character 库 (kù) means 'storehouse' or 'repository', emphasizing the function of organized storage, especially for valuable or bulk items. Together, 仓库 reinforces the concept of a dedicated, functional storage facility — more formal and institutional than casual terms like 储藏室 (chǔcángshì, 'storage room').

This word is commonly used in logistics, retail, manufacturing, and e-commerce contexts. It appears in official documents, business reports, and signage (e.g., '仓库入口' — 'Warehouse Entrance'). While it can refer to any large-scale storage space, it typically implies industrial or commercial use rather than personal storage. In spoken Chinese, it’s neutral in register — appropriate in both professional and everyday settings when discussing supply chains or physical infrastructure.