In order to store data related to your app and users, your server will need a database—a piece of software that is dedicated solely to data storage and retrieval.

Databases come in many variants. In this book, our focus is NoSQL databases, which are so named because they don't use the traditional table-oriented SQL data access architecture that is used by the more well-known relational databases, such as Oracle, MySQL, and PostgreSQL. NoSQL databases are very novel in their design and features and excellent for the tackling of the challenges that one may face in modern app development.

The NoSQL database that we will use throughout this book is MongoDB (it is often abbreviated as MDB or simply Mongo). MongoDB is a document-oriented database ...

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