Canon refers to all the information arising from the original, or officially sanctions, material.
In Supernatural, in addition to the TV Show, canon covers material in the:
- Official Site
- Comics
- Supernatural novels: Nevermore, Witch's Canyon among others.
The notion of what comprises the canon is subjective, and both fans and the creators of a body of material will have differing opinions on the topic. On this Wiki, canon from sources other that the TV Show contains a superscript tag to indicate its source, so readers can ascribe their own hierarchy or value to the information.