Crypto is a digital asset secured by cryptography. It is difficult to counterfeit it or double-spend it. It is decentralised and distributed. It facililates peer-to-peer transaction of digital assets, with no intermediary.

It is an alternative asset class. It runs on blockchains. It can run smart contracts, e.g. Bitcoin and Ether. It is essentially a virtual currency, the transactions of which are recorded on blockchain, making it irrefutable and immutable. A blockchain is akin to a public ledger.

Bitcoins halving occurs once in four years. The most recent occurred in 2020. In every bitcoin halving, the mining reward is curtailed by half and at the same time rate at which new coins are released in circulation.

Social media and Internet celebrities endorse cryptos. It therefore spreads across the world.