Massively Multiplayer Online games, or MMOs, are online video games that allow thousands of players to interact in a virtual world simultaneously. Players can create characters, complete quests, and engage in battles, often collaborating or competing with others. These games typically feature expansive environments and rich storylines. MMOs can be categorized into various genres, including MMORPGs (Massively Multiplayer Online Role-Playing Games) and MMOFPS (Massively Multiplayer Online First-Person Shooters). Popular examples include World of Warcraft and Final Fantasy XIV. Players often form communities, join guilds, and participate in events, enhancing the social aspect of gaming.