Answer
An embedded document stores related data inside a parent document. Embedding improves read performance and is recommended for one-to-few relationships.
Quick Answer
Embedded documents store related data together in one document (address inside a user doc). Recommended when data is accessed together, relationship is one-to-one or one-to-few, and child data doesn't grow unboundedly. Referencing stores the related document's _id and uses $lookup for joins. Use referencing for many-to-many, frequently changing data, or data shared across documents.
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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