Cryptocurrency is a digital currency that uses cryptography to secure transactions. Bitcoin was the first cryptocurrency, created in 2009. YOcoin is an alternative cryptocurrency (altcoin) created in 2015. It has some advantages over Bitcoin like faster transaction times of 2.5 minutes versus 10 minutes for Bitcoin. YOcoin uses the Scrypt algorithm for mining rather than Bitcoin's SHA-256. The document discusses how YOcoin works, how to use it, differences from Bitcoin in mining and transactions, and the development roadmap for YOcoin.