What are variables in JavaScript?

Short answer: Variables are containers to store data. let age = 25; Variables are containers to store data.

Example code

let age = 25; Variables are containers to store data. Example: let age = 25; Variables are containers to store data. Example: let age = 25;

Real-world example (ShopNest)

In ShopNest’s cart UI, a click handler closes over productId. Use let in loops so each button keeps the correct id.

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.