Whereas Apex Web Services allows an external application to invoke Apex methods through web services, Apex Callouts enable Apex to invoke external web services. This allows you to connect to 3rd party web services such as Google, Amazon, Facebook, and any other external web service.
There are two main ways to develop callouts with Apex: (a) Import a WSDL into Apex (b) HTTP (RESTful) Services classes.
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