Apex Integration Services | Apex Integration Overview

Integrate with external apps using Apex REST and SOAP services.
Make Callouts to External Services from Apex
An Apex callout enables you to tightly integrate your Apex code with an external service. The callout makes a call to an external web service or sends an HTTP request from Apex code, and then receives the response.

Apex callouts come in two flavors.

Web service callouts to SOAP web services use XML, and typically require a WSDL document for code generation.
HTTP callouts to services typically use REST with JSON.
These two types of callouts are similar in terms of sending a request to a service and receiving a response. But while WSDL-based callouts apply to SOAP Web services, HTTP callouts can be used with any HTTP service, either SOAP or REST.

Resources
REST vs SOAP: When Is REST Better?
Trailhead Live: Trail Together - Apex Integration Services

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