That is the most important question which all these ICOs and tokens can't answer. If they can't be used for anything useful or provide very value that means their price is just a bubble led by naive investors and speculators/scammers.

Everything you need to know about cryptocurrency is right here in this comment.

“What does it do?”

“Why would you ask that? Just BUY BUY BUY”

I once saw a hilarious answer to the question about unique uses of blockchain as a general concept. One user said that it is great for "tracking of diamonds". O.M.G. People expect other to pay money and invest time in development of a tool to enable even more closed-in and tightly controlled global monopoly by De Beers mafia cartel :)

At risk of taking the bait... why wouldn't that question be important?