How does EF Core detect changes in entity properties?

Short answer: EF Core tracks changes via: Snapshot change tracking: EF stores a snapshot of original values when entities are loaded, and compares them before saving. Notifications: If your entities implement INotifyPropertyChanged, EF can track changes immediately. EF compares the current values to the original snapshot during SaveChanges().

Real-world example (ShopNest)

ShopNest’s order service uses EF Core to save an Order and its line items in one SaveChangesAsync() call inside a transaction.

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.