How Aggregation Framework works in MongoDB | Aggregation Framework in MongoDB

In MongoDB, aggregation operations process the data records/documents and return computed results. It collects values from various documents and groups them together and then performs different types of operations on that grouped data like sum, average, minimum, maximum, etc to return a computed result.
The aggregate function accepts an array of data transformations which are applied to the data in the order they're defined. This makes aggregation a lot like other data flow pipelines: the transformations that are defined first will be executed first and the result will be used by the next transformation in the sequence.

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