Development of Internet and mobile devices has significantly contributed to the formation of today’s society. That change is specifically noticeable when it comes to younger generations including children and adolescents who have become addicted to being constantly online from earliest age. Internet is a tool which makes our everyday life significantly easier, when it comes to communicating and connecting to the rest of the world. At the same time providing us with education and entertainment, as well as containing informations about everyday events, both locally and internationally. Nowadays, Internet has become necessary media in normal everyday functioning, electronic communication and information exchange. Mobile devices have become an integral part of every household, so it goes without saying, that nowadays, every person, including children has at least one mobile device (not including other devices like computer, laptop, TV, tablet...). We can easily say how people became addicted to internet as well as mobile devices, and became slaves of media that surround them. This thesis will show problems related to excessive and uncontrolled addiction to Internet and mobile devices when it comes to children of pre-primary education, as well as numerous positive and negative sides related to this topic. One more thing that is really concerning related to usage of Internet is virtual violence which is most common among children since they are the easiest to target.