What are echoes?

Echoes are when sounds come back to you after bouncing off something.

Imagine you're in a big empty room and you shout, "Hello!" The sound goes out, hits the wall, and comes right back to your ears, like a reply from the wall! That’s an echo.

When you make a sound, it travels through the air as little waves. If there's something far away, like a mountain or a big building, those sound waves can hit it and bounce back. You hear them again, that's your echo!

You might have noticed this when you're in a bathroom with lots of tiles. When you shout, the sound bounces off the walls and comes back to you quickly, making it feel like someone is shouting back.

Or think about throwing a ball at a wall, it goes whack! and comes right back to you. Echoes work kind of like that, but with sound instead of a ball!