Coming soon to a Crypto Exchange near you.

As a seriously curious new cryptophyte, I was excited to learn that there are blockchains other than Bitcoin and Etherium. As I learn more about Litecoin and others,,what are the main differences?
Could someone explain in layman terms the main characteristic differences?
Flash is a new arrival to the crypto space that isnt shy of explaining its presence is not intended to compete with the big 5 that exist on the top of the www.coinmarketcap.com list of mind bending market caps.
The top dogs, Bitcoin,Etherium and Ripple make major fortune 500 companies blush in growth.
I have heard that the company intention lies somewhere around "if Bitcoin is the dollars in digital currency, Flash would do well being the change."