Electronic Bitcoin crypto currency was created in 2009 (development started in 2007), a programmer or a team of programmers with the pseudonym of Satoshi Nakamoto (who is still not known). In 2009, Satoshi published the source code of the system and this event can be called the beginning of the existence of the crypto currency.
What is Bitcoin (Bitcoin, BTC) in simple words? This is a new generation of decentralized digital currency, created and operating only on the Internet. No one controls it, currency issuance occurs through the work of millions of computers around the world, using a program to calculate mathematical algorithms. This is the essence of bitcoin.