Maybe I have this wrong, so correct me if I am wrong.
A "bitcoin" is not currency as in the yen, dollar, pound. Yet it can be converted into/out of those.
It's value is changing, so one bitcoin might cost/be worth $5.00 now, $10 or 1 penny tomorrow?
It's value or worth has nothing to do with anything tangible, such as a gold reserve or real estate to back it up.
Rather, it has to do with stock in the coin/company that are buying and selling it and current value of that in the market? Sort of like shares in a company? Or is it merely like an online version of a token?
bitcoin is a currency. they call it digital currency, since it is just virtual, there is no coins, notes that someone representing bitcoins interests, would print out.
"It's value or worth has nothing to do with anything tangible, such as a gold reserve"
just like the USD since 1971.
so we could argue that printing a new currency like bitcoin is as legitimate as printing paper called USD. however, I bet that would be made illegal for some reason in most countries, including the US.
anyway, the way it has been designed, there is no head (such as the fed) to control the emission of bitcoin. it seems to be self regulated.
if there was a head, it would just not work; the guys who control the bitcoins would have been identified and the fed/ecb would have cut these guys' heads already.
just like any currency, its value fluctuate.
it's still quite new, and most people still trust traditional currencies like EUR, USD etc first, so it remains small, but slowly gaining momentum.
there has been a hype around bitcoins recently and its value went super high in a short time (bubble).
some ecommerce are accepting bitcoins as a currency to buy goods. recently i read that a pub somewhere in EU was now accepting bitcoins.
just like any other currency, you can trade it with goods and with another currency like the USD.
just do a google search for bitcoin, it is no more an underground geek thing.
just like any other currency, the more people will accept to use bitcoins (or any other e-currency), the more value it will gain.