In World of Warcraft, there are quests that can be completed once per day. Some of them are the same every day. However, there are some quests that are randomly available:
Outland Dungeons - Two daily instance quests — one heroic difficulty and one normal difficulty — which randomly rotate to a different Outlands dungeon each day.
Battlegrounds - One battleground per day is selected for the daily quest.
Cooking Quests - The Rokk in Shattrath is looking for a different food each day, sending players to various zones.
This site is a location for players from World of Warcraft to quickly see what's available in their realm each day. Since there is no way to automatically update from a website or in-game, this site relies on players updating each realm each day. Simply add a realm to your favorites, then you can see it or update it right from the home page.