It’s not an actual coin, it’s “cryptocurrency,” a digital form of payment that is produced (“mined”) by lots of people worldwide. It allows peer-to-peer transactions instantly, worldwide, for free or at very low cost.
Bitcoin was invented after decades of Make money with bitcoins into cryptography by software developer, Satoshi Nakamoto (believed to be a pseudonym), who designed the algorithm and introduced it in 2009. His true identity remains a mystery.
This currency is not backed by a tangible commodity (such as gold or silver); bitcoins are traded online which makes them a commodity in themselves.
Bitcoin is an open-source product, accessible by anyone who is a user. All you need is an email address, Internet access, and money to get started.
Where does it come from?
Bitcoin is mined on a distributed computer network of users running specialized software; the network solves certain mathematical proofs, and searches for a particular data sequence (“block”) that produces a particular pattern when the BTC algorithm is applied to it. A match produces a bitcoin. It’s complex and time- and energy-consuming.
Only 21 million bitcoins are ever to be mined (about 11 million are currently in circulation). The math problems the network computers solve get progressively more difficult to keep the mining operations and supply in check.