The Online Public Access Catalogue (OPAC) is one the tool to retrieve the information sources. The features of OPAC are having more slant to the requirement of the library function such as acquisition cataloguing circulation, serial control and OPAC random search strategic on resource information retrieval and services. Further the OPAC resource safe of the library and information centres are going to be an electronic media without much services oriented (OPAC) man power further is dominated by the information database manager such process the data for user friendly interaction with OPAC facilities. OPAC is changed the whole panorama of system and its methodologies as a revolution in the library centre, the characteristics features of a computer development which makes then popular one is because of its usage, storage, retrieval, accuracy, consistence and automatic functioning sequence. The World Wide Web infrastructure has brought a revolutionary change in the organization and presentation of information. The web is a powerful new medium, through which any person or organization can publish messages for consumption or use by anyone who has access through WEBOPAC. The WEBOPAC is an increasingly important resource in many aspects of life like education, employment, government, commerce, health care, recreation, and more. The WEBOPAC is used for receiving information as well as providing information and interacting with society. This technology can be used to provide interactive virtual tour of any information services which has a prevalence of collections of information on any discipline. The present works aims at analysing the concepts of Online Public Access Catalogue (OPAC).
