Understanding the fundamentals of blockchain, and in particular Ethereum, provides the foundation for the development of a host of decentralized computing applications. Historically, we have relied on the server/client model of computing. However, blockchain is not stored in a central location or managed by a single entity – thus opening an enormous opportunity to leverage peer to peer networks to distribute tasks. Decentralized Apps (DApps) are tackling challenges in financial integrity, privacy, political transparency and accountability, product sourcing and provenance, and more.