Lone druids are druids without animal companions. Druids are closely tied to nature — of all the classes, they represent the closest connection to the natural world. Because of this, many druids befriend specific animals, taking them as their animal companions. A druid's animal companion serves as a steadfast ally, and is useful in combat, vigilance and espionage. However, some druids — particularly among the night elves — give up the standard animal companions. They may feel that it is unfair to put a living member of the natural world through the perils of adventure; they might feel they work better alone; or they might have some other reason. These lone druids focus their extra energy on improving either their combat or spellcasting abilities.
The playable druid in World of Warcraft is likely the lone druid version of a Druid of the Wild. Like lone druids, playable druids do not have animal companions, and instead rely on spellcasting or shapeshifting abilities.