Answer
$project selects, removes, or transforms fields, helping control output structure and performance.
Quick Answer
$project in aggregation reshapes documents - include specific fields (field: 1), exclude fields (field: 0), rename fields (newName: "$oldName"), and add computed fields using expressions. Reduces document size early in the pipeline to minimize memory used by subsequent stages. Similar to SQL SELECT - define exactly what fields you want in the output.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ