On YouTube, it's something that we use to give information about
our videos that make anything that isn't too self explanatory a whole lot more clear, or to present the video as more interesting. Countless YouTubers ignore these often resulting in the posting of a stupid comment or question that's unnecessary because it was likely to be answered in the *
drumroll please...* description!
These comments tend to become so sad that users need to include 20
FAQs in their descriptions because
the idiots won't shut the hell up.
Read the comments to any video posted by GuitarHeroPhenom and you'll understand. They're also enough to keep someone entertained for a while, as the stupidity is legendary.