What is SSR versus CSR?
PICTURE THIS: 1, 2, 2, 8
Simple meaning
CSR means the server sends JS and the browser builds HTML after download.
WHY — Next.js instead of guessing?
Why interviewers care about Next.js:
contrast on Next.js, not two memorised paragraphs.
the developer, then one case where picking wrong hurts.
Name the idea, why it exists, then one short example.
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1CSR means the server
sends JS and the browser builds HTML after download.
- 2SSR means the server
sends HTML already filled so the user sees content sooner.
- 3Hydration then attaches React
event handlers to that HTML.
- 4Give an example
One tiny concrete case you can say aloud.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
CSR means the server sends JS and the browser builds HTML after download. SSR means the server sends HTML already filled so the user sees content sooner.