What is a List<T> in C# and when should you use it?

Short answer: List<T> is a generic collection in C# that represents a dynamically sized list of elements. It resides in the System.Collections.Generic namespace and grows or shrinks as needed. Use it when: You need a resizable array-like structure You want to perform frequent insertions, deletions, and searches

Example code

List<string> names = new List<string>(); names.Add("Alice");

Real-world example (ShopNest)

In ShopNest, an order page loads products with List<Product> so you can Add items to the cart and access them by index. Use IEnumerable<T> when you only need to loop (for example, printing invoice lines).

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.