Incremental Updates: Migrate databases in a non-disruptive manner. For example,?

Short answer: first add the new field as nullable, then gradually update services to use it before removing old columns.

Real-world example (ShopNest)

ShopNest splits Catalog, Cart, Order, and Payment into services so teams can deploy catalog changes without redeploying payments.

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.