Bitcoin (BTC) made simple:
Bitcoin is a digital currency that operates on the internet without the control of any bank or government. All its transactions are recorded in a public and secure database called blockchain, which is like a large accounting book shared by thousands of computers around the world.
New Bitcoins are created and awarded to "miners" who verify these transactions. Its value comes from its scarcity (there will only be 21 million Bitcoins) and the demand it generates.