Describe what MongoDB is and its main advantages.

MongoDB is a document-oriented NoSQL database that stores data in BSON format (an extension of JSON). Unlike relational databases, MongoDB does not use tables and rows but works with collections of documents.

Main advantages of MongoDB:

• Flexible schema: documents can have different structures, which simplifies changes to the data model.
• Scalability: supports horizontal scaling through sharding.
• High performance: optimized for fast read and write operations.
• Built-in replication support: ensures fault tolerance and data availability.
• Ease of use: queries are written in a JSON-like document format, which is convenient for developers.

Example of a document in MongoDB:

{
  "_id": "507f1f77bcf86cd799439011",
  "name": "Ivan Ivanov",
  "age": 30,
  "skills": ["Python", "MongoDB"]
}

MongoDB is well-suited for projects with rapidly changing data structures and large volumes of information.