What is the difference between ng build and ng serve?

Short answer: Comman Purpose ng serve Builds app in memory, runs a dev server, watches files, reloads on changes (for development) ng build Builds app to disk, generates production or development-ready output files

Real-world example (ShopNest)

A shared CartService is injected into header and product pages so both see the same cart count.

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.