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Example of tracking options for druid in Cat Form
Tracking refers to any ability which allows the player to track resource nodes or mobs on the mini-map. Only one tracking ability can be active at a time. A control on the border of the mini-map allows the player to choose which type of tracking to enable (or none).
When a mob-tracking ability is activated, every creature that fits the classification selected shows up on the mini-map as a labeled dot, color-coded to its friendliness (green) or hostility (red). Tracking can be used in a variety of ways to enhance the hunter's situational awareness. For instance, in an area populated by both beast and humanoid mobs, the hunter can switch between beast and humanoid tracking, and stay aware of where ~95% of the mobs are in his general vicinity. Tracking is also useful if one has to beat a hasty retreat to a rearward fortification for safety's sake. Just keep monitoring the mini-map while switching frequently between tracking modes to find the most aggro free escape route. You can also see the name of the mob (or player/pet) if you mouseover the dot on the minimap, which for instance makes finding one specific mob in a group of mobs easier.
Any character who has the Mining profession can sense mineral veins.
Any character who has the Herbalism profession can sense herbs.
Engineers with {[loot|rare|Ultra-Spectropic Detection Goggles}} or one of the epic engineering helms automatically track mote clouds when they have them equipped.
/Patch 4.0.1 (12-Oct-2010): Too many different things to mention are now trackable. Most tracking methods now stack. Find treasure, sense demons and sense undead removed.
/Patch 3.0.2 (14-Oct-2008): The ability for players to search for low-level quests was added.