What is the purpose of a lighthouse?

A lighthouse serves as a navigational aid for sailors, helping them identify dangerous coastlines, reefs, and safe entry points to harbours. The light emitted from the lighthouse, often intensified by lenses, acts as a beacon visible from great distances. Each lighthouse has a unique light pattern, known as a “characteristic,” which helps mariners distinguish one from another. Historically, lighthouses were staffed, but modern versions are often automated. Iconic lighthouses, such as the Eddystone Lighthouse in England, have played critical roles in maritime safety and are now symbols of coastal heritage.