CGI MERN Stack Mid

What is the Virtual DOM in React?

React keeps a lightweight copy of the UI tree. On state change it diffs and updates only changed DOM nodes. ShopNest product filters re-render the list, not the whole page chrome.

CGI rounds often probe: Government/enterprise delivery.

Themes commonly reported in public MNC interview experiences (AmbitionBox / LinkedIn / Glassdoor-style). Practice aloud; keep answers this short in the real round.

More CGI MERN Stack questions

Explain useState and useEffect with a real example.
What is middleware in Express?
Explain the Node.js event loop simply.
MongoDB vs SQL — when do you pick each?
How do you secure a MERN API?
How do you fix unnecessary React re-renders?

All MERN Stack questions

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