Anyone can buy bitcoin but Bitcoin mining is a peer-to-peer process that is used to fool-proof and verify transactions between users. It includes addition of Bitcoin transaction data of past transactions to the Bitcoin’s public ledger. A group of transactions is called block. Bitcoin miners secure these blocks and stack them one above the other to create a chain. A blockchain is the ledger of all past transactions.
I have been requested several times now to help clarify what Cryptocurrency is, why it exists and the difference between Crypto/Digital Exchange Currency and 'Traditional Currency'. It is a rough one for anyone to comprehend to be honest, therefore I'll do my best to keep it as easy as I can, here goes... Money as we are aware of it now comes in the kind of notes and coins - these are made (printed) at principal repositories and commanded by central banks (in state banks) and authorities - in our case in britain, BoE.