Guilds are the main focus of the Guild Wars game. While in a guild members get a cape and guild tag located after their names. 
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There are thousands of guilds in the game that players can join. When someone is a member they gain access to the guild’s hall which holds many treasures. Guild leaders can buy merchants of all types; dye, rune, weapon, hats and place them in the guild hall for people to use. The guild hall is a central location for guild members to go to and do everyday activities in the game such as sell their stuff, get new skills, rune their armor, and have idol chit chat with other players.
Guilds also have the opportunity to participate in Guild verses Guild (GvG) games which raise their ranks on the Guild Wars Ladder. One of the main things most guilds in the game do is join an alliance. Being part of an alliance allows for contact with additional gamers and therefore more people to play with.