DOTs

From Twilight Wiki

Damage over Time, generally abbreviated as DoT and or simply dot, refers to inflicting some damage on one's foe which will be applied at a regular interval for a limited duration. Typically in World of Warcraft, the damage is applied every X seconds, where X varies from one DoT to the next. A DoT may be applied using a variety of methods — from a spell, a trap, a weapon, a poison, or some other form. Most DoTs are target specific, but some are also used as Area of Effect (AoE) attacks.

The Warlock is the most well-known class for using DoT type attacks with their spells, probably followed by the Rogue who can either use poisons or inflict lasting wounds with their special attacks.

DoT's are often referred to as periodic damage by Blizzard.