Suggest an editImprove this articleRefine the answer for “What is a nested document (embedded document)?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)An embedded document is a document stored as a field inside another document: it lets you describe related data within a single structure instead of spreading it across separate entities, with no need for a separate collection. **Key point:** it fits "one-to-one" entities or "anything that logically belongs to the object", and it cuts down the number of queries - no `JOIN` is needed, the data is read straight out of one document.Shown above the full answer for quick recall.Answer (EN)ImageAn embedded document is a document stored as a field inside another document. It lets you describe related data within a single structure instead of spreading it across separate entities. ### Example: ```json { "name": "Alex", "address": { "city": "Berlin", "street": "Main St.", "house": 12 } } ``` ### Key characteristics 1. **Stored inside the main document** There's no separate collection or record, everything lives in one object. 2. **Convenient for related data** It fits "one-to-one" entities or "anything that logically belongs to the object". 3. **Cuts down the number of queries** No JOIN is needed, the data is read straight from one document. **Summary:** an embedded document is a way to store related data entirely inside one MongoDB document, preserving structure and simplifying access.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.