This document discusses online gaming and its effects. It describes popular massively multiplayer online (MMO) games like World of Warcraft and their revenue. It outlines both potential positive and negative physical effects of gaming, such as increased fitness but also obesity. Mentally, gaming may improve strategies and problem-solving in children, but also promote hostility, violence as normal, and poor grades. Both benefits and detriments to socialization are explored. Sources are cited to provide examples of these effects.