Launched in 2009, Bitcoin is the world's largest cryptocurrency by market cap.
Unlike official currencies, Bitcoin is created, distributed, exchanged and stored using a decentralized log (main ledger) system known as a blockchain.
Bitcoin can be said to have a turbulent history when taken as a savings tool: the cryptocurrency rose to roughly $ 20,000 per coin in 2017, but two years later, trading was less than half of that.
As the oldest cryptocurrency to meet widespread popularity and success, Bitcoin has inspired many other projects in the blockchain space.