How to implement callout integration in Salesforce?

Hi Suniti,
In Salesforce a 'callout' is any https call that accesses an external URL -- some other web services or website. A 'calling' would be the opposite -- some external web service or application using the Salesforce API to access Salesforce data.

For more information:- https://developer.salesforce.com/page/Apex_Web_Services_and_Callouts

Thanks

Hi,

Just to add a Note -

Before any Apex callout can call an external site, that site must be registered in the Remote Site Settings page, or the callout fails. Salesforce prevents calls to unauthorized network addresses.

If the callout specifies a named credential as the endpoint, you don’t need to configure remote site settings. A named credential specifies the URL of a callout endpoint and its required authentication parameters in one definition. To set up named credentials, see “Define a Named Credential” in the Salesforce Help.

Hope this helps.