I believe I have a decent understanding of how Bitcoin works, but sometimes when I read news I stumble upon "the blockchain technology" - blockchain for banks, blockchain for medical records, blockchain for real estate and so on. From my understanding, most of them are private blockchains
Permissioned blockchains use an access control layer to govern who has access to the network.[59] In contrast to public blockchain networks, validators on private blockchain networks are vetted by the network owner. They do not rely on anonymous nodes to validate transactions nor do they benefit from the network effect.