Sonar

Real World Example

Imagine you're in a dark room trying to find your way around without bumping into furniture. Just like you might clap your hands to listen for the echo bouncing off nearby walls to gauge their distance, sonar uses the reflection of sound waves to locate objects underwater. In both situations, sound waves are sent out and their echoes provide information about the surroundings; for you, it's about avoiding obstacles in the dark, and for sonar, it's about detecting underwater objects.