TheSovereignGrave said
No, it's just the coupling of characters. It doesn't have to be illogical at all; it's shipping as long as they're not actually in a relationship with each other. At least, from what I know.
No, cause some people who are in relationships are shipped. For example: Harry/Ginny, Han/Leia, Aragorn/Arwen, Sora/Kairi, Robin/Starfire, and many more!