(adsbygoogle = window.adsbygoogle || []).push({}); Discord is a free voice and text communication service like skype. The difference between skype and discord is that discord will have "rooms" or servers where you can host a voice and text chatroom. These servers are usually dedicated to a whole lot of different things.

I would have to say the reason it is so popular is that it looks better than skype, runs better than skype, has individual volumes for every person so everyone is comfortable, a lot of moderation features like the ability to mute others, link videos and photos and watch them in the discord app itself, and comes with a ingame UI.

Its particularly more useful for the gamer fanbase I think.