Bitcoin is the currency. Blockchain is the technology. In the other words, besides bitcoin, there are many other cryptocurrencies which are using the same technology, blockchain.
Well, in order to greet the spike of bitcoin prices recently (it has reached 16K / BTC), let’s write something about bitcoin.
This video is a great simple introduction what is bitcoin, blockchain, and how it works.
Want more information about other cryptocurrencies? This article mentioned some of them.
In addition, I agree that it seems blockchain is none of the things as it was supposed to be when it was created at 2008 by Satoshi Nakamoto. It was created as peer to peer payment without any middleman, hence no fees required. Also since it is anonymous, bitcoin is often mentioned as ‘money’ that is used to perform illegal transaction.