Client to keep the Wowhead database up to date
The Wowhead Client is how we keep our database up to date!
It serves two purposes:
It installs and maintains an addon called the Wowhead Looter, which collects data as you play regarding items, npcs, quests, droprates, locations, and lots of other things.
It uploads the collected data to the Wowhead website so it can keep our information up to date!
You don't need to run it every time you play the game -- just when you want to upload your collected data to the server.