In WildStar there are 6 different classes (Arcane Marksman, Esper, Warrior, Assassin, Medic, and Tech Pioneer), which can differ significantly from the stereotypical class profiles of other MMOs. For example, each class can become a damage dealer (DD) and also fill another role (Tank or Healer).
In the fifth episode of the Wildstar Cast, Darion takes a closer look at the various classes of the sci-fi MMORPG. He provides a basic overview of how the classes play, but also discusses the advantages and disadvantages of each playstyle.