Mongo DB Atlas
A fully managed database service in cloud with mongo db as the core of Atlas for data storage and retrieval.
Cluster
A group of servers which stores the data.
Replica Set
A few connected machines that store the same data to ensure that if something happens to one of the machines the data will remain intact.
Comes from the word replicate - to copy something.
Instances
A single machine locally or in the cloud, running a mongodb software.
Features provided by atlas
Manage cluster creation.
Run and maintain database deployment.
Use cloud service provider of your choice.
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