What is the difference between tracked and untracked queries?

Short answer: Tracked queries: EF Core tracks entities returned from the query. Changes to them are monitored and persisted. Untracked queries: EF does not monitor the returned entities. Faster, read-only access. Tracked (default): var user = context.Users.FirstOrDefault(); Untracked: var user = context.Users.AsNoTracking().FirstOrDefault();

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.