The document compares SOAP (Simple Object Access Protocol) and REST (Representational State Transfer) as web service protocols, highlighting their differences in data exchange formats, architecture, and security features. SOAP is a standard messaging protocol that uses XML, providing built-in error handling and security, while REST is an architectural style that enables scalable web services over HTTP, supporting multiple data formats like JSON and XML. The choice between the two depends on project requirements, with SOAP being preferable for standardized communications and REST for simplicity and speed.