Ultima Online (UO) is a graphical massively multiplayer online role-playing game (MMORPG), released on 24 September 1997, by Origin Systems. It was the first game of the genre to reach widespread popularity and has had immense influence on all later games of this type. Ultima Online is a fantasy role-playing game set in the Ultima universe. It is known for its extensive player versus player combat system. Since its release, it has added eight expansion packs, a booster pack, and dozens of free content updates.