As with other MMORPGs, players control a character avatar within a game world in third- or first-person view, exploring the landscape, fighting various monsters, completing quests, and interacting with non-player characters (NPCs) or other players. Also similar to other MMORPGs, World of Warcraft requires the player to pay for a subscription, either by buying prepaid game cards for a selected amount of playing time, or by using a credit or debit card to pay on a regular basis.
To enter the game, the player must select a realm—sometimes referred to as a server. Each realm acts as an individual copy of the game world, and falls into one of four categories. Available realms types are: