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SS KarthickSS Karthick 

Web services and Email Services

Hi Evrybody,
      I want to know about what is web services,Email Services and API
So can anyone give me the sample example for all those I mentioned above....
Give me the video tutorial for all If possible

Please Help

Best Answer chosen by SS Karthick
Anup JadhavAnup Jadhav
That is very broad range of topics.

Web services - you can write apex methods and expose them as webservices (either soap or REST) so that external systems can call them.
EmailServices - again in the context of apex, you can write email services that can trap incoming emails to a specific email address and do something with it (ceate task, update contact record etc.)
API - salesforce provides different wsdls (enterprise, partner wsdl) to integrate with salesforce (inbound) . You can also consume an external wsdl to do a callout to an external system (outbound).

Check out the apex developer guide: http://www.salesforce.com/us/developer/docs/apexcode/index_Left.htm
also check out integration resources - https://developer.salesforce.com/page/Integration