Online Service: Online means the state of being in direct and immediate communication with the computer on which the database is loaded from a remote terminal. It is an interactive system i.e. it allows the user to input instruction, receive responses and then modify or manipulate the retrieved results. Almost all organizations today have shifted to the online services by way of the following-
i) Online Public Access Catalogues (OPAC) / Webcats;
ii) CD Rom search facility;
iii) Developing library websites;
iv) Developing different kinds of databases;
v) Acquisition of database, e-journal, e-book;
vi) Building digital library / institutional repository;
To provide access to all the above resources, a modern library offers internet facility to the user. Introduction of digital section in most of the 21st century libraries also acts as a base of many modern services.