Bitcoin is the first implementation of a concept called "cryptocurrency", which was first described in 1998 by Wei Dai on the cypherpunks mailing list, suggesting the idea of a new form of money that uses cryptography to control its creation and transactions, rather than a central authority. The first Bitcoin specification and proof of concept was published in 2009 in a cryptography mailing list by Satoshi Nakamoto. Satoshi left the project in late 2010 without revealing much about himself. The community has since grown exponentially with many developers working on Bitcoin.
I do believe that bitcoin is created/invented under the name Satoshi Nakamoto, he is unknow person or maybe a group of people. They invented bitcoin as a reward on miners for a mining process and just so happen that is used by miners for buying services and goods. Bitcoin is a cryptocurrency and a payment system made for exchanging into other cryptocurrency and created decentralized.