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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 research 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.
This network also validates all the transactions through cryptography.
How does Bitcoin work?
Internet users transfer digital assets (bits) to each other on a network. There is no online bank; rather, Bitcoin has been described as an Internet-wide distributed ledger. Users buy Bitcoin with cash or by selling a product or service for Bitcoin. Bitcoin wallets store and use this digital currency. Users may sell out of this virtual ledger by trading their Bitcoin to someone else who wants in. Anyone can do this, anywhere in the world.
There are smartphone apps for conducting mobile Bitcoin transactions and Bitcoin exchanges are populating the Internet.
How is Bitcoin valued?
Bitcoin is not held or controlled by a financial institution; it is completely decentralized. Unlike real-world money it cannot be devalued by governments or banks.
Instead, Bitcoin's value lies simply in its acceptance between users as a form of payment and because its supply is finite. Its global currency values fluctuate according to supply and demand and market speculation; as more people create wallets and hold and spend bitcoins, and more businesses accept it, Bitcoin's value will rise. Banks are now trying to value Bitcoin and some investment websites predict the price of a bitcoin will be several thousand dollars in 2014.
What are its benefits?
There are benefits to consumers and merchants that want to use this payment option.
1. Fast transactions - Bitcoin is transferred instantly over the Internet.
2. No fees/low fees -- Unlike credit cards, Bitcoin can be used for free or very low fees. Without the centralized institution as middle man, there are no authorizations (and fees) required. This improves profit margins sales.
Other advantages being - digital signatures , instant payments and international payments without any charge.
Although it has its perks but you should not invest into something without actually knowing it.