Following the Service Oriented Architecture, Web Services offer an ideal solution for integrating heterogeneous, distributed applications on a Web scale. The collection of XML based standards, which make up the infrastructure of Web Services, makes this possible. Providing automation to discover and execute these services increases their potential many-fold, by enabling their use in dynamic business processes. Semantic Web Services provide machine processable, interpretable information about service descriptions and service functionality. This additional information helps in realizing automation of Web Services. This work presents means of incorporating semantic annotations into the development of Web Services. WSDL-S, an extension of WSDL with semantic enhancements, was developed as a part of this work. The work also discusses METEOR-S Semantic Web Services Development Tool, used for building Semantic Web Services.