Blockchain is a distribuited database,so for understand how work a Blockchain you have to understand first how work a distributed database.
A distributed database is a database that isn't only physically located on a server (computer),but which is located in multiple computers at the same time.
An example may be on all computers that are connected to the network.
The information,in this way,can be found very quickly,as the computer power use the power of all connected computers.
There are basically two processes that allow distributed database to work properly,and not lose data on the way.
FIRST ONE is:Database Replication,is a software responsible for analyzing the database to identify changes.
Once these changes are identified,the software ensures that these changes are replicated and that all databases are identical.
SECOND ONE is:Duplication,this is a process that ensures that all databases have the same data.
It basically identifies a master database,which then duplicates on all the other databases,so as to make them the same.
Users can only modify the master database,ensuring the local data is not overwritten incorrectly.
So...blockchain is basically a deployed database deployoment.Becoming famous for Bitcoins.
Blockchain is a distributed database where a set of records,called block,is recorded.
HOPE I HELPED SOMEONE,tell me in the comment what do you think about this little relation.
P.S. i'm new in this world