This study addresses the importance of privacy and trust in the use of online search engines. This is important, because online search engines have become the most important tool for searching information. Hence, generalisation of search engines has led to the point, where increasingly amount of personal information is being collected from users. Due this, there has been increasing concern about privacy of users and therefore trust to those services is at risk. This study has been accomplished by literature overview and tries to answer following question: what does user privacy and trust mean in the use of online search engine? This study aims to show that improving user knowledge about search engines can also improve their concerns about online privacy. This will ultimately lead to a point where better trust toward the service can be achieved. At the moment, biggest issue in respect of user’s privacy is their lack of knowledge. Because this lack of knowledge, users are incapable to interfere with the online privacy problems. Additionally, one of the main results of this study is relation between privacy and trust. What this means is that users should consider their own comfortable level of privacy. Through this they can choose correct service for example online search engine, where they can build trust.