Player Created Lore is additions to Blizzards official Warcraft lore made by players. Mostly this is represented through background stories of characters, where the lore may not be very specific about the events that eventually lead to this specific characters situation. The additions to the lore can be everything from something really small like just making specifics about a famous character's visit in a town, to something big like creating own orc clans or making a seperate space shuttle for the Draenei.
This category holds the articles on this wiki which includes stories and lore which are not officially made by Blizzard. Most of the articles will most likely be character pages, as that's the most common place to insert ones own lore and history.