Ever expanding set of Web and ICT services has changed the way of learning and communication and research.Discovery system is a platform to facilitate Single Search box to search all resources the Library and it provides result based on relevance. Academic libraries are transforming from federated search technologies to Web Scale Discovery system. The WebScale Discovery services increase the value of the library by providing high research productivity with a single search box. This paper highlights the Web Scale Discovery and the importance of the discovery tools and services for academic libraries.