Introduction to Web Services
Web service is a small units of code which is independent of operating system and programming languages, it is designed to interact directly with other applications over the internet in other words Web Services are means for interacting with objects over the Internet.
Web services are
Existence of Web Services:
In Object - Oriented Languages two objects used to communicate using methods
Drawback : got limited to the same Application.
To overcome the limitation of usability of the object within the application came COM
Component Object Model (COM) : which allows to interact between two or more objects on the same computer with different applications. Which is specified in the below diagram.
Drawback: if we need to access the obects which is being defined in the other computer. To overcome this came the DCOM model.
Distributed Component Object Model (DCOM) which allows to interact between two or more objects within in the same network.
Drawback : in web based application it got limited to the internet. To over come this Microsoft came up with services in internet called WEBSERVICES
web services, which allows two object to interact internet. That is it allows to interact between two object on different computers and even not within same local network