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Bitcoin is a digital coin that has value. Bitcoin is not owned by a central entity such as a government or a central bank, in other words it’s decentralized. It is easy to operate, and can be sent quickly and securely from any point in the world to another.
Due to being a decentralized coin, the Bitcoin value is determined in a free market, without any manipulation from a central body.
The current Bitcoin USD rate can be seen on this page. You can trade transactions here