This thesis study deals with the notion of media literacy and its great role in today's society which is exposed to media and its influence more than ever. The main providers of media education in Croatia are Croatian language teachers despite the fact that they are not trained in teaching such topics. The media are a source of information and entertainment for all generations in all world cultures thus becoming one of the key tools of socialization affecting behavior, attitudes, and worldviews. Violent media content might have a very negative impact on preschool children who are still learning how to control their feelings and behaviors since they find it harder to differentiate reality from fiction. Advertisers have impact on opinions and preferences towards particular products, especially in children and young people who still have not developed critical approach. Apart from parents who have the most important role in protecting children from the negative influence of television, advertisers and various Internet threats, there are also legal acts and regulations. The Electronic Media Act and Ordinance on the Protection of Minors in Electronic Media provide a set of rules for the protection of children from inappropriate content. Safe use of electronic media is important in order to protect the most vulnerable user groups since the electronic media are an integral part of their growing up. This study is conducted through a survey that consists of 21 questions about the children’s' habits related to electronic media, their parents' media literacy and parents’ knowledge about how to protect children in electronic media. Parents who participated are parents of third grade primary school students.