There is a vast amount of computing power around the world that is not used efficiently. There are an estimated 4 billion personal computers in the world and 90% of them have free capacities at any given moment. This is to say nothing of the idle capacities of other personal devices, like smartphones and tablets. In effect, this excess computing power is wasted.
Lots of startups are trying to use blockchain technology to take advantage of this inefficiency to meet different economic needs. The blockchain is exciting in this context because it provides an infrastructure for distributed computing power, while at the same time providing an incentive for individuals to link their idle devices to the network.