Bitcoin is a decentralized digital currency that operates on a peer-to-peer network. It was created in 2009 by an anonymous individual or group using the pseudonym "Satoshi Nakamoto". Bitcoin transactions are recorded on a public ledger called the blockchain, which is maintained by a network of nodes that validate and confirm transactions.

One of the key features of Bitcoin is its limited supply. Only 21 million Bitcoins will ever be created, and as of March 2023, approximately 18.7 million Bitcoins have already been mined. This means that Bitcoin is a deflationary currency, and its scarcity is one of the reasons why it has been compared to gold.

Bitcoin's value is highly volatile, and its price can fluctuate rapidly. In December 2017, Bitcoin's price reached an all-time high of almost $20,000, but then crashed to around $3,000 by the end of 2018. Since then, it has recovered and has been trading around $50,000 - $60,000 per Bitcoin in recent months.

Bitcoin can be bought and sold on various cryptocurrency exchanges, and it can also be used to purchase goods and services from merchants who accept it as payment. Some companies, such as Tesla, have even started accepting Bitcoin as payment for their products. However, Bitcoin's adoption as a mainstream payment method is still relatively limited, and it is primarily used as a speculative investment.