Blockchains, just by themselves, are a collection of nodes sharing data and agreeing on its state. To make blockchains useful for the end-users, applications are built on top of them. Simply put, applications which use a decentralized backend (like a blockchain), are called Decentralized Applications or DApps.

A simple example of a DApp is software wallet applications that allow the user to query and transfer balance on a blockchain while interacting with a familiar user-interface.

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