In video games, a clan, community, guild or faction is an organized group of video game players that regularly play together in one or more multiplayer games. Many clans take part in gaming competitions, but some clans are just small gaming squads consisting of friends.  These squads range from groups of a few friends to four-thousand plus person organizations, with a broad range of structures, goals and members. The lifespan of a clan also varies considerably, from a few weeks to over a decade. Numerous clans exist for nearly every online game available today, notably in first-person shooters (FPS), massively multiplayer games (MMO), role-playing video games (RPG), and strategy games. There are also meta-groups that span a wide variety of games. Some clans formed by groups of players have grown into multi-million dollar professional esports teams.
Many clans on Xbox One, PlayStation 4, and computers have official clan websites with forums to interact and discuss many topics with the rest of their clan.  They offer in-clan awards and medals for clan achievements ranging from time in the clan to wins and contributions to the group like donations and prizes for giveaways. The terms alliance and team are also used for this purpose in, e.g., Illyriad or Freeciv.
As the first-person shooter (FPS) genre became increasingly popular, the idea of a competitive clan became widely accepted. Clans became teams, or elite clan members form teams to represent the clan in online battle.  FPS clans normally host servers with rules that they like. For instance if a group of gamers like to use pistols only they could join a clan that runs a pistols only server and the clan would enforce the rules.
Clans also exist in other genres, where they are often referred to by a different name and serve a purpose more suited to the game. Many massively multiplayer online (MMO) and role-playing video games (RPGs) tend to call them "guilds" or invent their own term. Examples of this include Star Wars Galaxies ("player associations" ) and EVE Online ("corporations" ). EVE Online is also notable for having defined the system in more detail than is common in most MMOs, with "alliances" being a larger grouping. The final form of community in Eve is known as a Coalition which are grouping of multiple alliances, this system isn't supported by the game software instead are a player driven creation. In the superhero-based game City of Heroes, they are called "supergroups", and are similar in structure to comic book hero organizations like the X-Men. In Final Fantasy XI, such clans are called "linkshells" and players of the game have the tendency and ability to be in more than one at once. Final Fantasy XIV also shares the same system for Linkshells as Final Fantasy XI but also with the addition of "Free Companies"  which allow for the more traditional form of Clan and Guild system seen in most MMORPG games.
Many simulation games, such as those in the Microsoft Flight Simulator series, have clans that follow similar patterns to other genres. Notable types of simulation clans include virtual airlines (VAs) and Virtual Military Organizations (VMOs). A virtual airline is a dedicated hobby organization that uses flight simulation to model the operations of an airline. VAs generally have a presence on the Internet, similar to a real airline. It has been proposed[ by whom?] that there are over 100 VAs of significance currently active, with tens of thousands of participants at any one time. 
A Player association is a group of players who have formalized their group using the in-game tools.
Corporations are groups of players joining together for a common goal or purpose, much like guilds or clans in other games.