Without further ado...

Basically. It's community driven, so people have to mark sections of the video as an ad, or filler, or whatever else it may be. Then you can set it up to skip particular sections, mute during them, or other things.

It makes it really easy to mark segments too, so while new or unpopular videos may not be marked when you watch them, it's easy for you to add the marks for others who see it.

Yes

yes!