Newbie wants to know usefulness of web service in web application

If i several different desktop softwares installed, then making web service makes sense as all desktop softwares will access the same central remote database through web service.

But what about website? Does it make any sense to use web service in website? Personally i don't see any sense in using web service for this (if i am not using any 3rd party functionality like paypal, Amazon etc. where database etc is located remotely). Why would i ever want my database to be remote from my web application?

In my college, sir has asked me to make whole website using web service. What can be the reason. Can anybody guess?Is it not sensel开发者_Go百科ess?

Are you trying to reuse any of the existing webservices to create your web application? Or are you going to expose some of your functionality in the application as web service. If your "sir" mean to reuse all of the existing services and give it a web face then it make sense.