Qualitative study method was used in the study to examine the effect of computer and internet use on children and adolescents. The development of children and adolescents in every sense is very important at all ages. Development of children and adolescents; It is a process that can show its effects both during the development period and after the end of puberty. Even as the age gets older, the development from childhood has an effect on the basis. Developmental disorders that occur in childhood or adolescence can be a problem at later ages. Certain responsibilities to be taken by parents and teachers against the problems that may arise in the future of children and adolescents are of great importance. Children and adolescents; Another important factor that can be beneficial to the development by reducing the developmental problems; computer and internet use. The use of computer and internet has increased its mass until today and it still continues today. Although it provides many benefits to children and adolescents, its harms are also seen.Computer and internet use greatly affects the developmental aspects of children and adolescents. As a result of the responsibilities of parents and teachers and timely measures, it is possible to make harmful effects useful. Parents always have child psychologists and child developers to assist parents, even if they do not have enough knowledge. As long as parents consult and follow their advice, they face very little distress.