To get a clear answer, you need to know what "Blockchain" means and its relation to cryptocurrencies. from wiki
A blockchain is a continuously growing list of records, called blocks, which are linked and secured using cryptography. Each block typically contains a cryptographic hash of the previous block, a timestamp and transaction data.
[1]This means with the use of Blockchain, transactions between the parties can be recorded and verified without the need for a third party.
Also, once data is recorded, they can not be changed retroactively
This means that this system is suitable for recording events, medical records, documentation, tracking, identities and all types of data recording, up to the voting systems.
Satoshi showed the possibility of using the system in remittances [cryptocurrency].
Source:
#1
https://en.wikipedia.org/wiki/Blockchain