|` MongoDB Atlas is an automated cloud MongoDB service that incorporates operational best practices, allowing developers to build on it with confidence. The service was introduced in 2016 and has been a phenomenal success since its launch. It offers features such as deploying Replica Sets in major cloud hosting providers and database clusters spanning multiple regions. To migrate data from an existing MongoDB database into MongoDB Atlas, developers must prepare for the journey by reviewing options and best practices, including upgrading to version 3.4 or greater and having sufficient RAM on the destination cluster. The migration process involves four basic steps: deploying a destination cluster, preparing for the journey, migrating databases, and cutover and modifying applications. Developers can choose from various methods, including Live Import, mongomirror, mongorestore, and mongoimport, each with its considerations and benefits. To avoid potential detours, developers must ensure sufficient RAM on the destination cluster, reduce latency if possible, whitelist IP ranges of the MongoDB Live Import process, ensure appropriate user access permissions, and size the operations log (oplog) appropriately.