A warehouse is a large building used for storing goods, products, or materials until they're needed somewhere else. Picture a massive room, maybe as big as several gymnasiums put together, with tall shelves stacked with boxes, pallets loaded with merchandise, and forklifts moving up and down the aisles.

Warehouses are essential links in how products reach us. When a company manufactures thousands of bicycles, they don't ship each one directly to a customer's house. Instead, they store them in a warehouse. When a toy store needs to restock its shelves, it orders from a warehouse. When you order something online, it often ships from a warehouse that might be hundreds of miles away.

Modern warehouses use sophisticated systems to track inventory: barcodes, computers, and robots help workers find exactly what they need among thousands or millions of items. Some warehouses specialize in keeping things cold, like food warehouses with giant refrigerators. Others store furniture, books, clothing, or just about anything people buy and sell.

The word can also be used as a verb. A company might warehouse its extra inventory during slow seasons, keeping products safe and organized until demand picks up again.