Blockchain is a digitised, decentralised, accounting method developed to facilitate Bitcoin transactions. The technology is used mainly to verify transactions (done by the user community rather than a central authority) and create a unique record that cannot be changed by anyone. When a Bitcoin is released through the process of Bitcoin Mining, it is added to the blockchain so all users have transparency to see that any transactions carried out to mine a Bitcoin are verified and legitimate.
What are cryptocurrencies?
What is Bitcoin?
Can I trade Bitcoin with AxiTrader?