Atlas is an application backend that is designed by Genius Yield to simplify the development of off-chain code for on-chain Plutus smart contracts. Some of its key features include an intuitive API for building transactions, leveraging first-class Haskell to avoid code duplication, and modular data providers for querying ledger state information.

Developers can also use Atlas to write realistic unit tests that correspond to on-chain behavior and execute integration tests against a Cardano node in a private network.Atlas is constantly evolving to stay up-to-date with the latest innovations in Cardano, such as Reference Inputs, Inline Datums, and Reference Scripts. Developers can access Atlas and get started with an end-to-end example by following the Getting Started guide on the Atlas website.

Full show notes at:
https://learncardano.io/podcasts/atlas-application-backend-for-cardano-dev/