In gaming, IGO stands for "In-Game Organization". It refers to a group of players who come together to form a community within a game. IGOs can take many forms, such as clans, guilds, or factions, and they are usually created to help players achieve a common goal or to enhance their overall gaming experience.

Within an IGO, players can share resources, work together on quests or missions, and compete against other IGOs in PvP (player versus player) battles. IGOs often have their own rules, hierarchy, and leadership structure, and they may even have their own websites or forums for members to communicate outside of the game.

Being a part of an IGO can add a social dimension to gaming and can help players form lasting friendships with others who share their interests. It can also enhance the gameplay experience by providing a sense of community and a shared sense of purpose.