A beacon is a light or fire set up in a visible place to guide people or send a signal. For centuries, lighthouses have served as beacons for ships, warning sailors away from dangerous rocks and helping them navigate safely to harbor. Before modern communication, people lit beacons on hilltops to spread urgent news across long distances: when one community saw a beacon flame, they would light their own, passing the message from hill to hill like a chain of fire.

Today we use the word more broadly. A radio beacon helps airplanes find airports in bad weather. A distress beacon sends out an emergency signal when someone needs rescue. GPS satellites act as beacons, sending signals that help your phone figure out where you are.

The word also describes anything that guides or inspires others. A great teacher might be called a beacon of knowledge, showing students the way forward. Someone working to solve a difficult problem can be a beacon of hope for others facing similar challenges. In this sense, a beacon doesn't just show you where to go; it gives you the courage and direction to get there.