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.