The phenomenon of sound being reflected off surfaces is known as echo. An echo occurs when a sound wave travels through the air, hits a surface, and then returns to the listener. The time it takes for the sound wave to return can indicate the distance to the reflecting surface. This phenomenon is commonly experienced in large, empty spaces such as canyons or auditoriums. Echoes are not only interesting in terms of sound perception but also have practical applications in navigation, such as by sonar technology in aquatic environments.