What is the purpose of the Peek() method in a Stack<T>?

Short answer: Peek() returns the top element without removing it. It’s helpful for: Conditional checks Previewing what's next Preventing accidental removal Example: if (stack.Count > 0)

Example code

{
var current = stack.Peek();
} Throws InvalidOperationException if the stack is empty.

Real-world example (ShopNest)

ShopNest uses a Queue<Order> for “orders waiting for payment confirmation,” and a Stack<Uri> for back-navigation in the admin UI.

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.