The main purpose of OPAC is to deliver users with a user-friendly interface for searching and retrieving library resources. OPACs enable users to conduct searches based on various parameters such as author, title, subject, keyword, and other criteria, making it easy for them to find the materials they need. OPACs also provide users with information on the availability and location of the resources they are searching for, enabling them to request or reserve items if necessary. OPACs are also used to gather statistics and data on library usage and resource utilization. Librarians can use OPAC data to analyze the frequency of resource use and identify trends in user behavior. This information can be used to optimize resource allocation, identify gaps in the collection, and improve library services. To analyze the application and satisfaction level of users in OPAC services, the present user study has been conducted in LNB Library, Dibrugarh University to gather feedback from users on their experience with the OPAC. A structured questionnaire was prepared and distributed among the users (Faculty/Research Scholars/UG/PG Students) of Dibrugarh University. A total nos. of 84 filled in questionnaire has been received which is 56 % of the total population of the study. The study reveals that library orientation/Information literacy programs are helpful for enhancing credibility amongst the users (55.99%) in OPAC search.