Bitcoin is a new asset class and a store of value that is more secure than Gold. It’s built on blockchain technology that is a completely decentralized network consist of miners.
Bitcoin is just an open source piece of code/software written by an anonymous person/group or company and published in October 2009 under the name “Satoshi Nakamoto”. Bitcoin’s white paper can be found here.
It is also being used as a currency and predicted to become a mainstream money in next 5 to 10 years. Bitcoin’s current market cap is over 100 billion US Dollars and rising very rapidly.