Ok with getting to technical... crypto is a form of money that isnt controlled by any government or bank as it is decentralized. Crypto is basically putting the control of your money back in your hands.

What it does? Well that is a complicated question as there are so many different coins/tokens that do various different things.

Some crypto is built on systems that will be creating the platforms that we will use in the long run

Ie. $ETH $EOS $LISK $NEO but to name a few.

There are other use cases for other platforms like steemit and Dtube. These two platforms allow their users to finally benefit from the content that we create.

There are so many use cases for crypto so its not as easy to try and sum it up in "what does it do..."