Definition

"A Distributed Application (DApp) is simply an application that lives on multiple computers in a network. Bitcoin is an example of a DApp, and Ethereum is a DApp as well, but also a platform upon which DApps can be built. All DAOs, DAIs, and DACs are implementations of different types of DApps." (http://distributed-autonomous-society.quora.com/Decentralized-Law-and-the-DAS)