Differnce between Web application & Web Service

Web Application	Web Service
Web application is for Users.	Web services are for machine/program to machine/program communication. Web services are intended for other                   applications
Web applications usually present data in HTML which looks nice to the user	Web services usually present data in        XML which easy to parse by other applications.
Eg. Calculator is an web application that uses add,subtract and many other webservices in combine.	Eg. To add 2 no.s we write a web service, to subtract we write a diffrent web service

                                   

Lets take an example of Google search. We can use Google search in two ways. First, we can visithttp://www.google.com and put out query for search. Google the returns the result. Second, we can integrate Google Search in our websites with custom search API.

In first case Google Search is acting as web application while in second example it is acting as web service.