In order for libraries to successfully meet the user needs for research and finding relevant information, it is exceptionally important that each library focuses on the library catalog as its main tool. In times of grat and significant technological changes, web search engines have become widely used and useful tool for finding information. With their simple design and relevant results, search engines have become a competition to library catalogs. This paper deals with the topic of library catalog tasks and user procedures in a modern environment, which means that it will talk about changes in modern websites and search engines and how these changes affect the wishes and needs of library catalog users. The aim of this paper is to explain what the tasks of the catalog are and to give an insight into the use of the library catalog in modern times on the example of the catalog of the University Library of Zadar. The focus group and interview method will examine the patterns of behavior of graduate students when searching the catalog of the University Library of Zadar as well as the reasons for using or not using the catalog. Research results showed that the library catalog is the last source of information for students while seeking for information, while web search engines have become the primary and highest quality source of information according to students. Also, the results of the research emphasize that the catalog of the University Library of Zadar needs a redesign to meet the needs of its users.