Explaining compression to you like you're actually five years old, since no one else seems to.
Alright, kiddo. Say you're watching TV and trying not to wake mommy. And the commercials are really loud. Way louder than your cartoons. So you grab the remote and turn down the commercials. Now things are at a good volume.
But now your cartoons are too quiet! So you turn the volume up when it's quiet back to where you like it. And then the commercials come on, and they're loud again! So you turn the volume down to normal, and when your cartoon comes on, you turn it back up. Commercials down, cartoons up. Again and again.
click here to read the entire article