MongoDB is a NoSQL document database that stores data in flexible JSON-like documents, providing scalability, performance, and easy development with dynamic schemas.

What is a document in MongoDB?

A document in MongoDB is a record stored as a BSON object, similar to JSON, containing field-value pairs. It's the basic unit of data in MongoDB collections.

What is aggregation in MongoDB?

Aggregation is a framework in MongoDB for processing and transforming documents through a pipeline of stages like match, group, project, and sort for complex data analysis.

Mongo DB Interview Questions

11. What is the _id field in MongoDB?

12. How are ObjectIds generated?

13. What are embedded documents in MongoDB?

14. What are referenced documents in MongoDB?

15. When should embedding be preferred over referencing?

16. What are common schema-design patterns in MongoDB?

17. What are one-to-one relationships in MongoDB?

18. How do one-to-many relationships work in MongoDB?

19. How do many-to-many relationships work in MongoDB?

20. What are indexes in MongoDB?