Bingo Book

The is a book containing any and all information on every missing-nin that all Jonin and members of ANBU of the major shinobi villages are given by their respective Kage to hunt down and assassinate. The purpose of this is so the village's secrets and/or kekkei genkai aren't stolen or examined by the enemy. Most villages have a special sect within their ANBU called hunter-nin whose sole purpose is the complete eradication of these missing-nin.

There are many versions of the Bingo Book beyond the means of simple Village differences. The main Book that serves a different purpose is that of the Akatsuki's, which is not in search of Missing-nin, but rather those of the people that possess the Demons, under the listings of those that must be returned alive, and those that are known to be the most powerful assets to a certain Village. This is mainly in the prose of Kakuzu, who is known for his greed and attacks many shinobi in the hopes of gaining their bounties. (Such as when he attempted to kill Kakashi for his 35,000,000 Ryou bounty.)

It is speculated that there are Bingo Books beyond those that belong to the ANBU and Jounin. It is assumed that the Lands and Countries have their own Books, simply because of the filler episode in which Naruto and his two comrades come across a plethora of bounty hunters outside of Iwagakure.