Bitcoin: The biggest and original cryptocurrency that launched an entire industry. It was envisaged by its pseudonymous creator (or creators) Satoshi Nakamoto as a “peer-to-peer electronic cash system”.
Blockchain: A type of distributed ledger, written on open source software. It is a growing database of time-stamped transactions that cannot be altered. Each new transaction is verified by a network of computers and added as a “block” to the chain.
Cryptocurrency: A currency created digitally, usually by private companies, and named after the cryptographic maths that make it possible. It was conceived in the depths of the financial crisis by Satoshi Nakamoto as a way for people to make electronic payments without going through any financial institutions.