Mostly the teenagers play online games just for fun unaware of the facts that there are great effects of playing these games even more than their imagination. Playing online has both positive and negative effects.

Some researches have shown that playing online games makes the mind of the player more active, particularly those who play puzzle based games. Those who play adventure games become capable of taking decisions in tight circumstances. The adventure games keep the player strategic, active and alert.
Users of internet have much improved typing skill and knowledge and online communication skill. Video games enhance creativity by allowing people to create music, compose symphony from their own feelings, movements and decisions. These games make them feel like an expert city planner, expert soldier, builder, die-hard, magician etc. These games develop capability in the player to create order out of complexity, create autobiographies, history and careers.
For marketing online game products, the companies have adopted a new strategy of advertising medical and educational benefits of playing games supported with researches, studies and opinions of doctors to back up.
Playing of games improves vision tests and improves problem solving skill and logical thinking ability of the children. Alertness, capability to locate things easily and communication skill have been found improved amongst the children who play games.
Besides positive effects, the online gaming has various ill effects also which should not be ignored. Physical health of the gamer is affected very badly. The children who play these online games have been found suffering from eye strains, back pains, problems in neck and wrist. Indications of hallucinations, photosensitive epilepsy and nerve and muscle damages have also been observed in the persons who play online games. It is also now being considered that playing games in long run may cause obesity.
Introversion and shyness is developed in a person who spends long hours in front of computer screen. The violent games may develop aggressiveness and lack of patience