If you don’t happen to be a businessman, but a person with a golden thumb with tech. Then, you might be able to lend the thinking power of your PC to sort out a few blocks on the Blockchain. The blockchain works upon compensating every such person (we call them miners) with shiny cryptocurrency.
Consider a huge variable, where your teacher awards you for guessing its value. On the other hand, for every guessed value, more variables add into the formula. This is what happens in the blockchain. Rewards are distributed upon completion of a block. On the other hand, a new block which is more complex from its predecessors adds into the blockchain.
So, to some people, it is not a business currency but a potential mine from which they can extract some ledger entries with knowledge worth bucks!