This document discusses web services and the Biodiversity Catalogue. It defines what web services are and provides an overview of the Biodiversity Catalogue, which allows users to register, find, and invoke web services. The Biodiversity Catalogue benefits both service providers and community members. For service providers, it provides easy registration, exposure to potential users, and community annotation of services. For community members, it allows exploration of web services through search and filtering and ensures long-term reliability of services through monitoring. The document also provides details on Web Map Services (WMS) and examples of WMS usage.