UDDI
UDDI (Universal Description, Discovery, and Integration) is a platform-independent XML-based registry standard for businesses to publish and discover web services. It provides a directory service where companies can list their services, enabling other applications to find and integrate them programmatically. Originally developed in the early 2000s, it was a key component of the web services stack alongside SOAP and WSDL.
Developers should learn UDDI when working with legacy enterprise systems or SOAP-based web services, as it was historically used for service discovery in service-oriented architectures (SOA). It is relevant in contexts requiring centralized service registries, such as large organizations with distributed systems needing dynamic service lookup. However, its use has declined with the rise of RESTful APIs and modern service discovery tools.