What are warrior cat comic books?

The Warrior Cats series has a number of comics (referred to as Manga), including the following story arcs:

1. The Lost Warrior
2. Tigerstar and Sasha
3. Ravenpaw's Path
4. Skyclan and the Stranger
5. The Rise of Scourge

Each of them tells a short story about events not shown in the other books in the warriors series.