What are database providers?

Short answer: SQL Server, PostgreSQL, MySQL — differences, limitations? Providers abstract database-specific implementations. Each supports different features & SQL dialects. Some features may not be supported on all providers (e.g., some EF Core features are provider-specific).

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.