*Key Components of a Web Service:* - **Client**: A program that sends a request to the web service. - *Server*: The web service that processes the request and returns a response. - *WSDL (Web Services Description Language)*: A document that describes the web service, its methods, and how to call them (for SOAP-based services). - *UDDI (Universal Description, Discovery, and Integration)*: A directory where web services can be listed and discovered. - *API (Application Programming Interface)*: A set of rules and protocols for building and interacting with software applications. Web services expose APIs that clients can call.