With respect to the blockchain, almost all of the technology is available before bitcoin, but no one thinks it works until bitcoin, so bitcoin is the first successful application of blockchain technology. To the extent that bitcoin is the first blockchain there's nothing wrong with it. If you want to understand the blockchain technology, Bitcoin is indeed a thing that can't go around.
Bitcoin is one product that runs on Blockchain. others said blockchain is a peer-to-peer network connected with miners computers that will confirm a transaction and will give the results of its confirmation to another computer, so that a transaction can happen