It is basically a distributed computing platform designed to handle money, idea is you make a program that handles money, and it runs in a decentralized manner, this way noone can interfere with it, for example you could make a program that tells the users the password to login on a dissident newspaper if they donate something, since it is decentralized the government would have a harder time taking it down. (that is just a simple example, people doing all sorts of stuff with this)