In this section, we will start by covering replication and how we can use it to make sure that we won't suffer any data losses. Sharding is the next topic, which helps us to achieve horizontal scaling in MongoDB. Finally, we will learn best practices and tips for high availability and fault tolerance when using MongoDB.

This section consists of the following chapters: 

• Chapter 12, Replication
• Chapter 13, Sharding
• Chapter 14, Fault Tolerance and High Availability