A hollow reed growing beside a river gave English one of its most versatile words. The trail begins with Semitic qaneh (reed), which Greek borrowed as kanna. Latin formed canalis from the related canna, meaning a pipe or groove — any narrow passage through which water could flow. Old French inherited canalis as chanel, and Middle English adopted it in the 14th century to describe the bed of a waterway. The word proved remarkably adaptable. By the 16th century it could mean any route through which something passed, and when radio broadcasting arrived in the 1920s, a channel became a specific frequency band — a fixed pathway for signals rather than water. Television extended the metaphor further, and the internet completed the transformation: what began as a physical groove cut in earth now describes invisible streams of data. The concrete image of water running through a reed tube still powers every modern usage, from the English Channel to a YouTube channel.