What is a document in MongoDB? How does it differ from rows in SQL databases?

document in MongoDB is a record represented as a JSON-like object (BSON format)

that contains field-value pairs. It can have a flexible structure, meaning each document in a

collection may contain different fields and data types.

Differences from SQL Rows:

• In SQL, a row is a fixed set of columns (defined by the schema), while in MongoDB,

document is more flexible and can vary in structure.

• A row in SQL is constrained by a schema, whereas a document in MongoDB can

store complex, nested data structures (arrays, sub-documents).