Invented in 2008 by an unknown person using the name Satoshi Nakamoto, Bitcoin is a decentralized digital currency functioning without a central bank. The increasing adoption of this digital currency from its beginning made the BTC an historical phenomenon. Some people - like THD in front of the very first paragraph of the Bitcoin whitepaper (by Nakamoto) - are praying almost religiously for a monetary revolution to happen.
Many have claimed to be Nakamoto but this mystery is still unsolved.