An Italian manufacturer of bicycle components. Tullio Campagnolo invented the derailler which changes the gearing on bicycles.
By the 1980's, the only major manufacturers of bicycle componentry were Campagnolo and Shimano.
Although of similar performance, bicycle riders who use Campagnolo componentry tend to hate Shimano componentry with hatred usually reserved for child molesters.
Campagnolo components are usually found on road bicycles.