SFDCWallah

SOAP:

• Simple Object Access Protocol(SOAP)
• SOAP return complete object
• XML based protocol
• Use WSDL file for communication

REST:

• Representational state transfer(REST)
• Lightweight because it returns only the changed state not the complete object.
• State of the object is returned
• Use XML or JSON format
• Transfer is over HTTP only
• Easy to call from JavaScript

For detailed information follow this link:

https://xperiencepartage.wordpress.com/2019/01/17/soap-vs-rest-api