A decentralized application (dApp) is a software application that runs on a distributed computing system, such as a blockchain. Unlike centralized applications, dApps are not controlled by a single entity and are often open source, meaning the source code is available publicly. This makes them resistant to censorship and manipulation, allowing users to interact with the application in a more secure, trustless environment. Decentralized applications can be used for a variety of purposes including finance, health, IoT, content management, voting, and much more.