Human needs food, water and shelter to live. Today, in addition to these three, 'Information' has become the fourth fundamental need for successful living. Realizing the role and importance of information, libraries have been basically established to fulfill the intellectual needs of human being and hence they are performing three fundamental functions viz. 1. Acquisition of knowledge, 2. Documentation and 3. Dissemination. These three functions are equally important and associated with one another. Acquisition is primary function of library and it should be performed by focusing on users so that it helps to enhance the quality of library contents. Identifying users need and also participation of users in selection of information sources definitely adds to worth of library collection and services. Documentation is the detailed process of classifying, indexing, abstracting, labeling and shelving it in proper order to enable users to access it easily. Role of professional and trained staff having rich experience is more important in documentation process. Success of library services depends upon documentation. Dissemination of information to the users is the last function of library. It includes variety of services such as announcement, CAS, SDI, abstracting, information literacy etc which is familiar and user oriented. It thus maximizes the use of library contents.