A Blockchain Is a decentralized satabase that is stored across a network of nodes this allow for transparency and verification across the network of nodes to make sure that information this database is not being altered or skewed with a Blockcahin you can do many useful things such as write smart contracts issue asset tokens or another great feature of Blockcahin is the gouvernance seeing feature of doing voting for elections this can be extremely useful with today's corruption in the political system where people don't feed like their vote actually being counted with Blockcahin voting system so you are able to verify that your vote was counted and that  the vote that you cast was for the party that you chose, another great feature of Blockcahin is being able to audit those Blockcahin.  
So all transaction on that Blockcahin can easily be gathered through the use  of view keyes such as with manero and superior coin or with bitcoin it's transparent system so all parties can see all transactions that have been sent or recived on the bitcoin Blockcahin.
Blockcahin technology is said to be the 21st century and this is due to the trustless features of Blockcahin where no thrid party has to be trusted to hold up their agreement with the transactions that are being sent or processed on this Blockcahin.
![blockchain.jpg](https://steemitimages.com/DQmPqWN6WCaStMwyDjNDRXopJKvB1oWKugnajHEjxyKbJYh/blockchain.jpg)