Distributed blockchain is a technology for storing and transmitting information. It is a huge database containing the history of all the exchanges carried out between its users since its creation.
But it is not an ordinary database because it is transparent, secure and capable of functioning without a central control body or trusted third party.
Indeed, this database is based on peer-to-peer (P2P) exchanges. It is shared by its various users, without any intermediary.
Everyone can consult all the exchanges, present and past.
Moreover, unlike traditional databases, it is "distributed". This means that different copies of the database exist simultaneously on several computers called "nodes" in the network.
This secures the system and prevents the "blockchain" from being hacked.
Be careful because some crypto-actives projects do not use distributed blockchains.