Sharding is a methodology to distribute data across multiple machines. Sharding is basically used for deployment with a large dataset and high throughput operations. The single database cannot handle a database with large datasets as it requires larger storage, and bulk query operations can use most of the CPU cycles, which slows down processing. For such scenarios, we need more powerful systems.
One approach is to add more capacity to a single server, such as adding more memory and processing units or adding more RAM on the single server, this is also called vertical scaling. Another approach is to divide a large dataset across multiple systems and serve a data application to query data from multiple servers. This approach is called horizontal scaling. MongoDB handles horizontal scaling through sharding.
