App or service

Simple explanation:
1. You use web application for any of your application running in web environment. Just like you use VB to write application running on Intranet.
2. Web service is useless if it is standalone and not calling by anyone. It is ready to wait someone to call.
3. You can write application without web service, we use web service just because code reusable, standardization... because it just like a function library which can access from anywhere over the internet

Hope these will give you the basic understanding of it
 
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