This image illustrates the architecture of a MongoDB replica set, a core feature enabling high availability and fault tolerance in database systems. It shows how a client application connects through a driver to a primary node for write operations, while read operations can be served from either the primary or secondary nodes based on read preferences. The secondary nodes continuously replicate data from the primary to ensure redundancy. This architecture ensures that data remains available even during node failures, supporting automatic failover and distributed reads in modern application deployments.
