Span<T> / Memory<T>?

Short answer: Used for high performance scenarios involving: File processing Large memory structures Reduced garbage collection overhead Example Span<int> numbers = stackalloc int[3] { 1, 2, 3 };

Example code

numbers[1] = 10; Runs on stack → extremely fast.

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.