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Bitcoin is an online payment system invented by anonymous user 'Satoshi Nakamoto', who published his invention in 2008, and released as open-source software in 2009.
The bitcoin system is peer-to-peer, and users can transact directly with each other all over the world almost instantly, without needing an intermediary such as a bank, Western Union, Moneygram, Paypal or any other company. The bitcoin system works without a central repository or single administrator, so is the worlds first decentralized digital currency, and it is the largest of its kind in terms of total market value. There is no company or entity controlling bitcoin.
Bitcoin as a form of payment for products and services has grown, and merchants have an incentive to accept it because fees are lower than those typically imposed by credit card processors. Unlike credit cards, any fees are paid by the purchaser, not the vendor.