I will give you the simplest explanation base on my understanding of the blockchain.
First, let's go with the block, the block contains different information also transactions, the chain is from its definition connection into another.
How does related to the bitcoin?
Every time we made a transaction we called block and connected into a chain which is duplicates the information at the same time with encryption to make sure the security of it.
What are the things in real world like the blockchain?
we wrote all of the transactions we made and store into a secured place, by that we see all of the information we made on that transaction.
most of the time it happens on school records, they made paper copies at the same time they have a digital copy.
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