Cryptocurrency Bitcoin

Bitcoin is a one type of Cryptocurrency.  It was invented in the year 2008. It was invented by the unknown group of people using the name Satoshi Nakamoto. His identity still unknown. Bitcoin started to use in the year 2009. 
BTC full form is Bitcoin. 
It is a digital currency. Bitcoins store of value, a payment network. There is no physical Bitcoins available. Bitcoin not having any legal tender.

Block chain is a protocol on which Bitcoin network runs. Bitcoin uses peer-to-peer technology to work with no central authority or banks; managing transactions and therefore the issuing of bitcoins is administered collectively by the network. Bitcoin is open-source; its design is public, nobody owns or controls Bitcoin and everybody can participate . Through many of its unique properties, Bitcoin allows exciting uses that would not be covered by any previous payment system.