If you've attempted to dive into this mysterious thing called blockchain, you'd be forgiven for recoiling in horror at the sheer opaqueness of the technical jargon that is often used to frame it. So before we get into what a crytpocurrency is and how blockchain technology might change the world, let's discuss what blockchain actually is.
In the simplest terms, a blockchain is a digital ledger of transactions, not unlike the ledgers we have been using for hundreds of years to record sales and purchases. The function of this digital ledger is, in fact, pretty much identical to a traditional ledger in that it records debits and credits between people. That is the core concept behind blockchain; the difference is who holds the ledger and who verifies the transactions.
With traditional transactions, a payment from one person to another involves some kind of intermediary to facilitate the transaction. Let's say Rob wants to transfer £20 to Melanie. He can either give her cash in the form of a £20 note, or he can use some kind of banking app to transfer the money directly to her bank account. In both cases, a bank is the intermediary verifying the transaction: Rob's funds are verified when he takes the money out of a cash machine, or they are verified by the app when he makes the digital transfer.
The bank decides if the transaction should go ahead. The bank also holds the record of all transactions made by Rob, and is solely responsible for updating it whenever Rob pays someone or receives money into his account. In other words, the bank holds and controls the ledger, and everything flows through the bank.
This is not the case with blockchain and cryptocurrency. The whole banking system has been decentralized. Blockchain and cryptocurrency is a profitable investement if and only if you know how to play the cards.

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