True or False: Web service callouts can use REST.

The assertion that web service callouts can use REST is indeed true. In the context of Salesforce integration, web service callouts involve making requests to external services to retrieve or send data. Salesforce provides support for both SOAP and REST protocols for these callouts.

RESTful services are widely used due to their simplicity and efficiency, particularly in web applications where lightweight interactions are essential. In Salesforce, developers can implement REST web service callouts using HTTP methods such as GET, POST, PUT, and DELETE, allowing for a flexible integration with REST APIs.

The incorrect answer choice suggests that web service callouts cannot utilize REST, which undermines the capabilities that Salesforce provides for modern integration approaches. Understanding that Salesforce supports REST for web service callouts is vital for any integration architect, as it expands the possibilities for connecting Salesforce with a diverse range of external systems and services.