Because it might affect you Blockchain is a new technology created in 2008 during the great recession. The creator Satoshi Nakamoto created Bitcoin which runs on a blockchain.
Forget about Bitcoin why yes bitcoin and blockchain are synonymous to some or like PB&J For newbies to world of crypto and blockchain it will make it much easier to view these two items as two different objects. Think of blockchain like a information highway carrying all this data. Now think of Bitcoin or offshoots of Bitcoin such as Litecoin and Ethereum as fun cryptocurrency cars that sometimes drive on this highway but we don't need these cars to build a highway. Rather information can flow freely with no cryptocurreny cars in sight