Java Web Services Question:

UDDI, Universal description, discovery and integration
It is the directory that is used to publish and discover public web services.

DISCO, Discovery
Commonly known as Discovery. Discovery clubs together common services and exposes schema document of the web services.

WSDL, Web Service description language.
This is used to describe web services. The description includes
URL of web services
Method and properties supported by web services
Data type it supports.
Protocol detail it supports.