The easiest way to describe a Web Service is to say that if it is
done on the Internet, using Web protocols, and it does not involve
a live user operating a Web browser, then it is a Web Service.
More conventionally, Web Services are application components that use:
 
WSDL - Web Services Description Language, for self-
description.
UDDI - Universal Description, Discovery and Integration,
data, for mutual discovery.
TCP/IP, for transport.
HTTP, for interaction.
SOAP - Simple Object Access Protocol, for requesting and
granting actions, and
XML, for underlying representation.
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