Can Anybody explain me the difference between a Bapi and a webservice?

Hi Anil,
<b>BAPI</b>
BAPI is a library of functions that are released to the public
as an interface into an existing SAP system from an external
system.A BAPI function is a function module that
can be called remotely using the RFC technology
BAPI are RFC enabled function modules. the difference between RFc and BAPI are business objects. You create business objects and those are then registered in your BOR (Business Object Repository) which can be accessed outside the SAP system by using some other applications (Non-SAP) such as VB or JAVA.
In this case you only specify the business object and its method from external system in BAPI there is no direct system call. while RFC are direct system call Some BAPIs provide basic functions and can be used for most SAP business object types. These BAPIs should be implemented the same for all business object types. Standardized BAPIs are easier to use and prevent users having to deal with a number of different BAPIs. Whenever possible, a standardized BAPI must be used in preference to an individual BAPI. It is not possible to connect SAP to Non-SAP systems to retrieve data using RFC alone. RFC can acces the SAP from outside only through BAPI and same is for vice versa access.
<b>Webservice</b>
In simpler terms, WebService is an application on the Web/Internet. Wheneever Service is requested by the user, it provides the service (i.e Request/Response)
A web service is a collection of protocols and standards used for exchanging data between applications or systems
In SAP world, we can expose an application into the Webservice. For e.g We can expose ABAP programs into Webservice.
XI uses SOAP adapter to communicate with webservices see below...why only soap adpater???
-> Some remote clients or Web services providers are only able to communicate by means of SOAP messages
->SOAP adapter enables you to exchange SOAP message between remote clients and Web Service Servers and the Integration Server.
-> The SOAP Adapter provides a runtime environment that includes various SOAP components for the processing of SOAP message.
-> You use the SOAP adapter to connect such systems to the Integration Server directly
-> The SOAP adapter uses a helper class to instantiate and control these SOAP components
->The SOAP adapter receives a msg from the remote client or Web service provider, converts the SOAP protocol into XI msg protocol and then sends the msg to the Integration Server to be processed further.
Basically RFCs BAPI are all SAP oriented, Webservices are language / environement independent. So, all one has to do is publish a Webservice and any external system by providing the data in the correct format, can get the approopriate response back.
see these links to know more abt webservices..
http://www.webservices.org/
http://www.w3.org/2002/ws/
regards
biplab

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