The ability to remain hidden from your foes is useful in many scenarios, whether to avoid detection by a more powerful force or to sneak up on a foe and silently dispatch of them. Naturally those classes oriented around stealth are not only more adept at hiding and sneaking, but also more capable of exploiting it to their advantage.
At its very core, Hiding and Sneaking are skills available to any and all classes. They simply bestow upon the user the ability to not be detected by an enemy. Stealth classes gain an additional mechanic when they elect to hide, called the Base Available Stealth Score, or simply Stealth for short. Stealth classes special skills are based of the Current Available Stealth. For more information on the additional skills of Stealth classes, see the “Stealth Skills” section.