Bitcoin is virtual, just like the credit cards and online banking networks people use every day. Bitcoin can be used to pay online or in physical stores just like any other form of currency. Bitcoin can also be exchanged for physical currency such as Denarium coins, but mobile payments are usually more convenient. Bitcoin balances are stored in a large distributed network and cannot be modified by anyone maliciously. In other words, Bitcoin users have sole control over their funds, and Bitcoin cannot disappear just because it is virtual.
