Difficulty is a generically used term for how hard something is to complete (like a quest), fight (mob and their level colors), gather (resource), or learn (recipe). This info is usually indicated by color (hard, medium, easy, and no difficulty).
Difficulty for instances affects boss fight difficulty and loot drops.
In decreasing level of difficulty:
- Heroic mode raid only
- Normal mode raid only
- Flexible Raid mode (NYR) raid only
- Raid Finder mode raid only
- Heroic mode 5-man only
- Normal mode 5-man only
In Burning CrusadeThis section concerns content exclusive to The Burning Crusade.