The Blockchain is one of the most talked-about topics of the last few years. It appeared on Google Trends in 2013, but the keyword saw a spike in 2017.
A blockchain is a database distributed among the computers in a network. The difference between a blockchain and a normal database is that it is structured by blocks of data with specific memorisation capabilities. Once full, each block is closed and connected to the previous one, thus forming a “chain”.
When a block is inserted into the chain it can no longer be modified, unless you modify all of the others. For this reason the Blockchain guarantees the reliability and safety of the data, without need for a controlling entity, which would affect the speed of data processing.