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.. _aggregation-framework:
.. default-domain:: mongodb
Aggregations operations process data records and return computed
results. Aggregation operations group values from multiple documents
together, and can perform a variety of operations on the grouped data
to return a single result. MongoDB provides three ways to perform
aggregation: the :doc:`aggregation pipeline
</core/aggregation-pipeline>`, the :doc:`map-reduce function
</core/map-reduce>`, and :doc:`single purpose aggregation methods and
commands </core/single-purpose-aggregation>`.
.. only:: (website or singlehtml)
You can download this section in PDF form as :hardlink:`MongoDB
Aggregation and Data Processing <MongoDB-aggregation-guide.pdf>`.
.. include:: /includes/toc/dfn-list-spec-aggregation-landing.rst
.. include:: /includes/toc/aggregation-landing.rst
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