Answer
mongos routes application queries to the correct shards and abstracts the distributed cluster from clients.
Quick Answer
mongos is the routing layer for a sharded cluster. Client applications connect to mongos (not directly to shards). mongos queries the config servers for the chunk map, determines which shard(s) hold the relevant data, fans out queries to those shards, merges results, and returns to the client. It's stateless and you can run multiple mongos instances for high availability.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ