:"Deceptacon" redirects here, but is also the name of a song by Robbie Williams as well as by the group Le Tigre.
The Decepticons are usually depicted as the antagonists in the fictional universes of the Transformers toyline and related comics and cartoons, and the enemies of the Autobot. The villains take many forms, and have many different origins and stories across the numerous different Transformers media, but in almost all incarnations, they are led by Megatron. They are typically represented by the purple facial insignia they all wear. Primarily, Decepticons have red eyes, while Autobots have blue eyes. They are usually known for their air power, especially since many of them turn into aircraft. They often turn into military vehicles, construction vehicles and even smaller-than-human-sized objects.
Most Decepticons think very little of humans and consider them no better than pests or "insects". This is strongly emphasized in the 2007 film Transformers, when Megatron is seen flicking a human like a bug and saying "disgusting". Another example is when the Decepticon Frenzy complained about how the "stupid insects" tried to shoot him. In the animated series, Starscream works with the human, Doctor Arkeville and comments about how little he cares about destroying the entire planet Earth in order to achieve his goal.
In the Japanese version of the franchise, the Decepticons are called Destron or Deathtron ( Desutoron). The one exception to this naming convention is Car Robots, where the sub-group referred to as "Decepticons" in the Robots in Disguise adaptation, is known in Japan as the Combatrons (the Japanese name of the G1 subgroup known as the Combaticons). The overall name of the Robots in Disguise villain faction is Destronger. However, the Japanese Version of Transformers Animated uses Decepticon (ディセプティコン).
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Official Site: Transformers Official Site
Links: Wikipedia Answers.com Robots in Disguise