Bitcoin is a decentralized digital currency, without a central bank or single administrator, that can be sent from user to user on the peer-to-peer bitcoin network without the need for intermediaries. Transactions are verified by network nodes through cryptography and recorded in a public distributed ledger called a blockchain.
Bitcoin is unique in that there are a finite number of them: 21 million.
Bitcoins are created as a reward for a process known as mining. They can be exchanged for other currencies, products, and services.
 As of February 2015, over 100,000 merchants and vendors accepted bitcoin as payment..
Research produced by the University of Cambridge estimates that in 2017, there were 2.9 to 5.
8 million unique users using a cryptocurrency wallet, most of them using bitcoin..
Bitcoin has been criticized for its use in illegal transactions, its high electricity consumption, price volatility, thefts from exchanges, and the possibility that bitcoin is an economic bubble.
Bitcoin has also been used as an investment, although several regulatory agencies have issued investor alerts about bitcoin.
What happens if you buy 1 Bitcoin?
If you buy 1 Bitcoin today, you will be able to use it to purchase goods and services from businesses that accept Bitcoin as payment. You can also hold onto your Bitcoin and wait for it to increase in value.
Some people think that Bitcoin will eventually replace traditional fiat currencies (like the US dollar), but it is still too early to say for sure.