☛ BizTalk is a product while Web Services are a standard.

☛ BizTalk Server is a Microsoft product whereas Web Services have been developed by many organizations including Microsoft, IBM, etc.

☛ BizTalk Server application has been built to enable the internal business processes of organizations, operate with ease. Web Services are small applications published using UDDI to enable all the people find them.

☛ Web services are that they are platform neutral. BizTalk can leverage Web services.