How do you update data in MongoDB?

Short answer: You can use the updateOne(), updateMany(), or replaceOne() methods to update data.

Example code

db.collection.updateOne({ name: "Alice" }, { $set: { age: 27 } }); $set updates the value of a field. $inc increments a field's value.

Real-world example (ShopNest)

ShopNest’s SQL Server database stores customers, products, and orders. Good indexes and clear foreign keys keep checkout queries fast and safe.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.