Blockchain has become a buzzword over the years especially with the introduction of cryptocurrency. But, what exactly is blockchain? Well blockchain refers to a collection of records, used to document transactions that take place over time and is stored in a database-like structure. Blockchain has become a way to record and distribute information stored digitally that cannot be modified in any way. Blockchain forms the foundation of cryptocurrency, which has become increasingly popular over the years. Cryptocurrency is a form of digital currency that can be used to perform online transactions. Through using blockchain, cryptocurrency transactions are protected using complex encryption algorithms, thus preventing fraudulent behaviour and ensuring transparency. Some popular cryptocurrencies built on blockchain include Bitcoin, Litecoin and Ethereum.