Blockchain
A blockchain is a digital ledger that records transactions securly across many computers.
Quick Reference:
Decentralised. Digital Ledger. Cryptography. Once recorded, hard to change.
Expanded Explanation:
At its core, a blockchain is just a list of transactions but instead of being stored in one place, it is shared across thousands of computers worldwide. This decentralisation makes it nearly impossible to hack or alter. Each new set of transactions is grouped into a “block” and added to the chain. This creates a history that cannot be easily changed. This technology is the backbone of all cryptocurrencies and is also being used in other industries like supply chains and digitial identity.