What is the Aggregation framework in MongoDB?

How do you use

it?

The Aggregation Framework in MongoDB is used to perform complex data processing

tasks such as grouping, filtering, sorting, and reshaping documents.

It uses a pipeline of stages to process documents:

Example:

db.collection.aggregate([

{ $match: { status: "active" } }, // Filter documents

{ $group: { _id: "$age", count: { $sum: 1 } } }, // Group by age

and count occurrences

{ $sort: { count: -1 } } // Sort by count in descending order

]);