The era of Blockchain applications has just begun. Ethereum is here to be the defacto Blockchain platform for building decentralized applications. We already learned in the previous chapters that public Blockchain use cases are not just limited to cryptocurrencies, and the possibilities are only limited by your imagination! Ethereum has already made inroads in many business sectors and works best not only for public Blockchain use cases, but also for the private ones. Ethereum has already set a benchmark for Blockchain platforms and must be studied well to be able to envision how usable decentralized applications can be built with or without using Ethereum. Today, it is possible to build Blockchain applications with minimal knowledge of cryptography, game theory, mathematics or complex coding, and computer science fundamentals, thanks to Ethereum.