What is the cost difference between Azure Functions and App Services?

Short answer: Azure Functions (Serverless): Pay per execution and resource usage – cost-effective for sporadic workloads App Services: Pay per plan (CPU/RAM), better for constant workloads Choose based on traffic patterns and scaling needs

Real-world example (ShopNest)

ShopNest’s API runs on Azure App Service with staging slots—swap staging to production after smoke tests.

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.