A question-answer platform build atop a database network that powers the tokenization of content incentivization..
Lots of jargon there.. lol..
Basically its a place where people come and asks questions and volunteers will come and answer them. This concept is not new at all, Stakoverflow, YahooAnswers, Ask, Quora all does pretty much the same thing.
What makes Musing different is that now these questions and answers can get rewarded via the Steem blockchain. It's also much easier to run Musing as compared to the other platforms because the developers do not need to worry about database. It's all on the steem blockchain if they want to design it that way.