How do noise-cancelling headphones block out ambient sound?

Noise-cancelling headphones are like having a cozy blanket that stops loud sounds from reaching your ears.

Headphones normally work by sending music or voices directly into your ears, so you can hear them even if there's some noise around. But sometimes, the noise, like a plane engine or people talking, is too loud, and it’s hard to focus on what you’re listening to.

That’s where noise-cancelling comes in! These special headphones have little microphones that listen to the sounds around you. Then they use tiny speakers inside your ears to play a sound that is exactly opposite, like when you say “stop” to a friend who says “go.” The noise and the new sound cancel each other out, making it much quieter.

It’s like when you're in a room full of people talking, but you put on earplugs. You still hear your favorite song, and it feels like the whole world is quieter, just for you!