Tracking, as a skill, is common to many different MMORPG's and is usually restricted to the scout-rogue-thief archetypes.
Generally, it allows the tracker to detect the presence of mobs beyond visual range and, in some manner, lead their party directly to it.
In EverQuest, Rangers, Bards and Druids are the only classes that can use the Tracking skill. The Tracking list can be sorted by various filters such as name, distance or level/strength. As of the August 21, 2013 game update, the three Tracking classes now only differ in how far they can "see" NPCs or PCs with the skill. Rangers have the greatest distance.