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# Introduction to Web Services * * * Web Services can make your applications web applications. Web Services are published, found, and used through the Web. * * * ## Prerequisites Before continuing, you should have a basic understanding of: * HTML * XML If you want to learn these subjects first, please visit our (#) to access these tutorials. * * * ## What are Web Services? * Web Services are application components * Web Services communicate using open protocols * Web Services are self-contained and self-describing * Web Services can be discovered using UDDI * Web Services can be used by other applications * XML is the basis of Web Services * * * ## How Does It Work? The basic Web Services platform is XML + HTTP. HTTP protocol is the most common Internet protocol. XML provides a language that can be used between different platforms and programming languages. ### Elements of Web Services platform: * SOAP (Simple Object Access Protocol) * UDDI (Universal Description, Discovery and Integration) * WSDL (Web Services Description Language) We will explain these topics in later chapters of this tutorial.