What are the different currency types?

I would like to know more about the different kinds of currency in World of Warcraft.

Can anyone please tell me what the different types of currency are and what they're used for?

There are multiple types of currency available in World of Warcraft, in addition to gold. Each currency is earned a different way.

Current currencies

This section deals with currencies that are "current" as of the latest expansion - Mists of Pandaria.

Gold

Gold is the primary currency used for buying items from most vendors and from the auction house. Gold is tradable with other players in game through the trade window and can be mailed to other players by using a mailbox. Gold is earned by killing enemies, selling items, etc.

For more information on how to get lots of gold, see How can I earn lots of gold?

PvE points (Justice and Valor)

Player vs Environment points are split into Justice points and Valor points. These points are earned by killing bosses in dungeons, raids, and as a reward for using the dungeon and raid finder. These points can be spent at Justice and Valor vendors for relatively high end PvE gear.

PvP points (Honour and Conquest)

Player vs Player points are split into Honour and Conquest points. These points are earned by killing players in battlegrounds, arenas, and cities belonging to the other faction. These points can be spent at Honour and Conquest vendors for relatively high end PvP gear with resilience on it.

Questing currencies

Darkmoon tokens are earned by taking part in the Darkmoon Faire and can be used to purchase items from Darkmoon Faire vendors.

Lesser charms of good fortune are earned by completing Mists of Pandaria daily questions and used to purchase Elder charms of good fortune.

Elder charms of good fortune are used to "re-roll" on items that drop in Mists of Pandaria raids, to provide you more opportunities to get epic loot from Tier 14 bosses.

Timeless coins are earned from completing quests on Timeless Isle and are used for the purchase of relatively high end epic gear.

Mogu Rune of Fate are purchased using Timeless coins and are used to "re-roll" on items that drop in Mists of Pandaria raids, to provide you more opportunities to get epic loot from Tier 15 bosses.

Notable currencies from past expansions

Tol Barad Commendations area earned by completing daily quests and the Tol Barad PvP map and can be used to purchase a variety of items including low level items for level 85 characters, mounts and pets.

Marks of the World Tree are tokens earned by completing Molton Front daily quests and are used to purchase items and to progress through the Molton Front story line.

Mote of Darkness are tokens earned by killing bosses in the Dragon Soul raid, used for purchasing crystalline geodes (which contain high end Cataclsym gems).

Essence of Corrupted Deathwing are tokens earned by killing Deathwing in the Dragon Soul raid, used for purchasing elementium-coated geodes (which contain high end Cataclysm gems).

Illustrious Jewelcrafter's Token are tokens earned by completing jewelcrafting daily quests in your faction's capital city, used for purchasing Cataclysm jewelcrafting recipes.

Dalaran Jewelcrafter's Token are tokens earned by completing Dalarn jewelcrafting daily quests in Dalan, used for purchasing Wrath of the Lich King jewelcrafting recipes.

Champion's Seal are tokens earned and spent at the Argent Tournament grounds.

Money, is really purely gold, silver, and copper. There are, however, different forms of currency - Lesser Charms, Mogu Runes of Fate, Honor Points, Valor Points, etc.

So it depends on what type of 'money' you are referring to. If money, then the gold; otherwise there are quite a few different currencies within the game.