Explain the difference between a document and a collection in MongoDB.

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Document in MongoDB

• A document is the basic unit of data in MongoDB.

• It is a set of key-value pairs, similar to a JSON object (though technically stored in BSON, a binary format).

• Each document can hold different types of data: strings, numbers, arrays, nested documents, etc.

• Example idea: A document could represent a single user with fields like name, email, age.

• Every document has a unique identifier called _id.

Think of a document as one record in MongoDB.

Collection in MongoDB

• A collection is a group of documents.

• It’s somewhat like a "table" in relational databases, but unlike SQL tables, collections don’t enforce a strict schema.

• All documents inside a collection are usually related, but they don’t need to have the exact same fields.

• Example idea: A collection named users could contain many user documents, each representing a different person.

Think of a collection as a container (or folder) that holds multiple documents.

Key Difference

• Document = one single data record (like a row in SQL, but flexible in structure).

• Collection = a group of related documents (like a table in SQL, but schema-less).

✅ Analogy:

• Document = a single page in a notebook.

• Collection = the whole notebook containing many pages.

Read More :

What is MongoDB, and how is it different from SQL databases?

How do you implement authentication and authorization in Express.js?

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