What is shard and sharded cluster?

What is the shard and shard cluster in mongodb ?

Please enjoy https://www.google.com/search?q=mongodb+shard

This I am enjoying :slightly_smiling_face: already but the concept is not getting clearly cleared. So I posted here to get simple explanation.

Sharding is covered in Chapter 3 of M103.


Sharding is used to distribute data across the cluster, that means shard contains subset of the data in the shard cluster.
Shard could be defined as the part (node) of shard cluster that contains some part of the distributed data
Sharded cluster: This could be considered as group of shards (nodes) that includes config and mongos, that help to manage over all distributed data across the nodes and to the applications.