Universal Description, Discovery and Integration is a directory service where businesses can register and search for Web services.
A platform-independent framework for describing services, discovering businesses, and integrating business services.
UDDI is a directory of web service interfaces described by WSDL
UDDI communicates via SOAP
If the industry published an UDDI standard for flight rate checking and reservation, airlines could register their services into an UDDI directory. Travel agencies could then search the UDDI directory to find the airline's reservation interface. When the interface is found, the travel agency can communicate with the service immediately because it uses a well-defined reservation interface.