Span<T> / Memory<T>?

Answer: Used for high performance scenarios involving: File processing Large memory structures Reduced garbage collection overhead Example Span&lt;int&gt; numbers = stackalloc int[3] { 1, 2, 3 }; numbers[1] = 10; Runs on stack → extremely fast.

What interviewers expect

• A clear definition tied to Power Questions in High-Impact Interview Questions projects
• Trade-offs (performance, maintainability, security, cost)
• When you would and would not use it in production

Real-world example

In a production High-Impact Interview Questions application, teams apply this when handling user-facing features or integration boundaries. For example, you might use it during a sprint where reliability and observability matter—logging metrics, validating edge cases, and documenting the decision in an ADR so future developers understand why the approach was chosen.

How to explain in the interview

1. Define the concept in one or two sentences.
2. Context — where it fits in High-Impact Interview Questions architecture.
3. Example — a specific project, bug, or performance win.
4. Trade-off — what you gain vs what you sacrifice.

Tip: Practice aloud on Toolliyo mock interview or the Interview Q&A section before your real interview.