Aeternity is a decentralized applications platform.
Applications on æternity are called Aepps. The term "Dapps" is usually associated with Ethereum’s applications.
Since Aeternity will support pre-compiled Solidity smart-contracts, dapps will be able to run on æternity’s blockchain platform.
Nonetheless, we believe that æpps will become the preferred type of applications on æternity, since they will be based on the more reliable Sophia and Varna smart-contracts, developed specifically with security, efficiency and cost-of use in mind.