What is an echo?

An echo is a repetitive sound that is reflected back to the listener after the original sound has stopped. It is caused by the sound waves bouncing off a surface and returning to the listener, often with a delay. This phenomenon occurs when a sound is made in a location where there is a reflective surface, such as a canyon, valley, or a large, empty room. The sound waves travel outwards from the source, hit the surface, and then bounce back, creating the echo.

In a broader sense, the term "echo" can also refer to the repetition of a sound, idea, or action. In mythology, Echo was a nymph who was cursed by the goddess Hera to only be able to repeat the last words spoken to her. In literature and poetry, an echo can be a rhetorical device used to emphasize or repeat a phrase or idea.