Blockchain and cryptocurrency are two different things but they are inseparable.  Cyrptocurrency is digital currency which can be used in financial transactions and those transactions are automatically recorded in digital ledger called blockchain.  This is same with the existing accounting principle. Every transaction should be recorded properly for monitoring and transparency of records.  The good thing in blockchain is, it is made publicly and cannot be corrupt by hackers.  In this manner, you can see that in every cryptocurrency there is always the blockchain.