336 MH/S USB Bitcoin ASIC Miner Machine.
Bitcoin is the world's first decentralized digital monetary system, and "bitcoins" are the currency unit used by this system. The system has existed since January 3rd, 2009 and is used in every country in the world. Bitcoins are created and controlled by advanced mathematics and cryptography, instead of by governments or banks (no government, bank, or corporation owns or controls Bitcoin). Bitcoins as a currency unit are created over time at a diminishing rate, and there will never be more than 21 million of them in existence (though they are highly divisible).
Bitcoin is different from systems like Pay pal because
It is decentralized (no group has monopoly control over it)
It is not tied to US dollars or other government fiat currencies
It is impossible to suffer chargebacks or frozen accounts
It is (relatively) anonymous
Fees are optional (you may pay to make your transactions process slightly faster)
Thus, anyone in the world, of any age, in any country, for any purpose, may start accepting and spending Bitcoins immediately. It is a purely free-market currency which every human on the planet has the option of using. It returns the power of money to "the people" and away from "the banks" and "the government." The supply of bitcoins is mathematically controlled at a pre-determined rate, and cannot be inflated beyond this rate. There is no sign-up or approval process. If you wanted, you could have a Bitcoin account less than three seconds from now... you will have a Bitcoin account, instantly.