I've read some places that Trek canon is open to debate. I've read other places that the television series and movies are canon while novels, comics and games are not. It seems to me it should be either one or the other. So what is Trek canon? Is it simply individual opinion or something that is easily defined? And how is/was it determined?
Canon refers to a complete body of work. But in the case of official canon recognized by the studios it is what is seen on the screen. So what has been shown on the TV shows and movie theaters is canon. Novels comics and games are not canon.
However, we all have our personal canon and that can include anything we like.