Discord might be new term for some people, but it is basically trendy as hell. It somehow managed to make TeamSpeak and Skype obsolete, while being cross platform, slim and good looking at the same time.(reminded me of myself)
Jokes aside, this tool offers a convenience way to stay in-touch with Sklotopolis and his playerbase, even when Wurm is not calling.
Also for people not feeling the need to talk to humans(wouldn't either on my spare time), it is not actually like TS and does not require you to use voice chat or be in fact connected to type. Really hard to explain, however easy to figure out once you see it.
You need to be verified in order to use all the stuff on discord. Find out how to verify your account by reading the channel #how-to-verify on the discord server.