There are various ways to explain this but hopefully these video's below will explain what crypto currency is and why should you be concern about it.
Let's just say with Crypto no one controls the currency value, transaction fees are minimal, to almost no fees at all. No bank and government cannot control the currency and crypto can basically do whatever it wants to do around the clock.
Going Crypto will definitely change on how we bank, and how financial institutions make money, so it's a big threat to financial companies and governments who like controlling their currency.
But recent moves has changed all that and it's only a matter of time before more users, companies and vendors adapt the new way of life.
The future is coming for crypto so get ready.