Life in the technological age has its advantages and disadvantages. Everyone has the right to security and protection and this also applies to the question of security and protection on the Internet. This thesis deals with a theoretical theme regarding the safety and protection of children in the internet. The first chapter describes the Internet in general as a global network that offers various opportunities. Also, it describes what kind of Internet content is appropriate and inappropriate for children and how the Internet can be used in education in a positive way. The next chapter provides tips on how to achieve security on the Internet. The role of parental protection and filters can be set up and thus contribute to security online. In addition to security, the existing dangers of the Internet, such as malicious programs, identity theft, and the serious problem that is increasingly present in children and youth – electronic violence are described in this thesis. The chapter "Media Pedagogy" describes the importance of this pedagogical discipline as well as media literacy and media competencies that are necessary for "coexistence" with today's media. The next chapter deals with the protection of privacy in legal terms, as well as briefly described the laws in the Republic of Croatia relating to security, protection, personal data, electronic communications and the Criminal Code of the Republic of Croatia which prescribe certain penalties for committed crimes. The last chapter lists the most important existing projects in the Republic of Croatia which have been created precisely because of the issues discussed in this thesis. "Sigurnih pet za sigurniji net" and "Centar za sigurniji internet" are described. Also, the study "EU Kids Online Croatia" was presented and the research results relevant to this paper are listed.