What is Bitcoin?

What is Bitcoin?
Bitcoin is a online cryptocurrency
Anyone or anybody can't touch,see,fill this coin
Because it's a magical think and it's a
Invention .....year is 2009
sathoshi nakamo was the man who invented
This cryptocurrency.now Bitcoin is a most
Powarfull and most high profile cryptocurrency in the world . reports of 29/1/2018
1 Bitcoin price in USD is =11598.76$
There is to many cryptocurrency like Bitcoin
Ethereum, litecoin, Bitcoin cash,electro coin
,Tokas coin,bitcore and....or 50 kinds of cryptocurrency used in the online buy sell site.