This is because its value can fluctuate depending on the supply and demand.
Bitcoin, and many other cryptocurrencies, are currently more akin to market shares than to real money. Many herald this technology as the future of money, however the volatility of its market value continues to hold it back. When a new transaction occurs the blockchain is updated and every computer on the network updates. This is because the information is not stored in a centralised location but is spread over a network. At is core is blockchain technology, which allows for verifiable public ledgers that are practically un-hackable. On the surface it was a way for people to take back power from the failing banks that has caused the financial crash of 2008. Bitcoin has been a heavily debated hot topic since its conception in 2009.
