Death Note (object)

The Death Note is the killer notebook that forms a central plot point in the series. Shinigami use the Death Notes to kill humans and gain life from them. Some Shinigami allow humans to use their books and kill other humans for various reasons.

The Death Note is regarded by Near as the most deadly weapon in history.

Light Yagami's Death Note
Light Yagami found this Death Note outside of his school. It first belonged to Sidoh, but Ryuk stole it and dropped it to the human world.

Misa Amane's Death Note
Misa Amane's Death note was owned by Gelus, but Rem took it when he died. It was given to Misa by Rem.

Kyosuke Higuchi's Death Note
Kyosuke Higuchi's Death Note was previously Misa's Death Note. Misa gave ownership of this Note back to Rem, whom was instructed by Light to give it to a greedy human who would use it for his own gain. It was given to Kyosuke Higuchi by Rem.

Jack Neylon's Death Note (Mello's Death Note)
Jack Neylon's Death Note was previously owned by Sidoh, who came to the human world to retrieve it. One of Mello's henchmen traded the Death Note (which was at the time owned by Soichiro Yagami) for Sayu Yagami's life. It was given to Jack Neylon by Mello.

Differences between Death Notes
There are several cover designs including plain black (Rem's Death Note), English (Ryuk's 2nd Death Note, a.k.a. Sidoh's Death Note) and a Shinigami language (Gelus's Death Note, a.k.a. Rem's 2nd Death Note.) Other cover designs may exist as well, but this would be completely up to the Shinigami owning that particular Death Note. Interestingly, Death Notes can be red or white as well, though these are rarer than black Death Notes. Red and white Death notes have the same effects as black Death Notes.