With regard to the conceptual definition of aggression, it is important to note that this implies overt or covert social interaction with the intention of harming or harming another individual. With regard to the development of aggression, age and gender differences play an important role, so it is concluded that boys are more involved in physical conflicts, while girls are more prone to gossip, breach of trust, condemnation of appearance due to earlier development of language skills. As far as aggression itself is concerned, we can classify three types: normal aggression without hostile meaning, hostile aggression and repressed aggression. Under the patterns of aggression we can place factors such as biological determinants, social and environmental, and cognitive. Approach and therapy are important in the work and development of aggressive children. Such children should be approached appropriately given their enhanced stimuli. This is achieved in a way that aggressive behavior is not retaliated against, because it will create the opposite effect than expected. An aggressive child is approached calmly and without neglecting his needs and completely friendly. An aggressive child should be directed to talk and resolve the situation calmly, and professional and competent people who find the best alternative for each child are of great help.