What is useRef and how is it used

The interview started with a brief self-introduction, followed by several questions based on my open-source contributions and GitHub projects. The interviewer then discussed system design scenarios, asking how I would scale a backend system to handle 10,000+ users, what potential failure points could arise from features I had implemented, and what alternative approaches I had considered while designing backend solutions. The discussion then moved to frontend development, particularly React. I was asked about React Hooks, when to use specific hooks, and practical use cases for hooks such as `useState`, `useEffect`, and `useMemo`. Additional topics included event-driven architecture and JWT-based authentication. Finally, I was given a JavaScript coding problem related to the event loop, focusing on microtasks and macrotasks. I was asked to determine the order in which different statements would be executed and printed. This was the only question that I was unable to solve completely during the interview. Ended up not getting selected!