Support characters (who have all sorts of names, depending on the game) are built primarily for group play. Their skills help their team with extra damage, protections, control of the enemy, bonus healing or any number of other such 'buffs'. They can be back-up healers, produce extra damage, off-tank (that is, hold off an enemy as necessary) or perform other tasks. They tend to be more of a jack-of-all-trades and consequently are neither the quickest nor the slowest to advance while playing solo. Often, they have a good range of abilities which help them survive and allow them to do good damage to the enemy, but they can be seen as rather dull, since they are not at one of the extremes of damage or healing.
Los RG hacen un Hybrido de Tanque/Support en todo caso. De cualquier manera no se por que le dan vueltas al asunto, a los Palas los considerábamos support... pues bien, los RG aun tienen TODAS las skills del Pala a su disposición (Además de las que se agregan como RG). Y los Stalkers son más chars de Control que "Support" como tal.
Finally, Control characters (who again have a vast variety of class names) are built to provide a means of controlling the enemy. 'CC', as it is known - Crowd Control - can be vital in a group, particularly in games where the enemy has the option of running away and getting more help. By removing enemies from combat, the Control characters reduce the damage being done to the tank and can alleviate difficult situations, such as errant monsters battering the Healer. They often have spells or abilities to freeze, glue, immobilize, slow down or dismiss their targets.