Bitcoin is a revolutionary new currency that was created anonymously in 2009. Transactions are made with no middle men – meaning, no banks! There are no transaction fees and no need to give your real name. More merchants are beginning to accept bitcoins. You can buy services, pizza or even manicures. Bitcoins are earned when people compete by using computers to solve complex mathematical problems. Currently, a winner is awarded 25 bitcoins every 10 minutes. OR, one can buy bitcoins at a bitcoin exchange using various currencies.
Here are Bitcoin books that explain more about it:
Here are websites that explain it in full:
What is Bitcoin? (with introductory video)