It is well known by the term in English. Blockchain is a unique registry and distributed in several nodes of a network. In this case of cryptocurrencies, we can think of it as an accounting book where each of the transactions is registered, the complete chain is saved in each node. of the network that makes up the blockchain, as new records are created they are first verified and validated by the nodes of the network and then added to a new block that is linked to the chain.
It is a very powerful tool to communicate and store our information, since we do not depend on a company that provides the service