Documents

A document is the basic unit of data in MongoDB. It is similar to a row in a SQL database, but more flexible and stored in BSON format (Binary JSON).

Each document is a JSON-like structure made up of key-value pairs.

Sample Document

// document
{
    "name": "John",
    "age": 17,
    "class": "12A",
    "subjects": ["Math", "Physics", "Computer Science"]
}

Here, "name", "age", "class", and "subjects" are keys (or fields)

Their values can be:

• Strings ("John")
• Numbers (17)
• Arrays (["Math", "Physics", "Computer Science"])
• Booleans, objects, dates, and more

Analogy:

Imagine a document as a profile card of a person,

Relation DB	MongoDB
Column Name	Fields
Values	Records