What is the role of the ConnectionString?

Short answer: The ConnectionString contains information required to connect to the database, such as the database server, database name, credentials, and other configurations. Example: string connectionString = "Data Source=server_name;Initial

Example code

Catalog=database_name;User ID=user_name;Password=password;";

Real-world example (ShopNest)

ShopNest opens a SqlConnection only for the query, then disposes it (using). Connection pooling reuses physical connections automatically.

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.