Standalone mode and Replicated mode in MongoDB function differently and serve different purposes:
1. Standalone Mode: In this mode, MongoDB runs as a single instance, meaning there is only one node in the system. It does not maintain any data redundancy or provide high availability. This mode is usually used for development and testing environments where high availability and redundancy are not primary concerns.
1. Replicated Mode (Replica Set): In this mode, MongoDB has one primary node and multiple secondary nodes. These nodes have the same data which gets updated simultaneously. If the primary node fails, the secondary node takes its place, offering high availability. This mode also offers data redundancy since, in the event of data loss or a system failure, data can be recovered from the other nodes. This mode is used in production environments where data redundancy and system availability are crucial.
In short, standalone mode is used for simpler, testing environments, while replicated mode is typically used in production environments where high availability and data redundancy is needed.
