I've heard about a C-shaped neck, D-shaped Neck, V-shaped neck, ... But what does this actually mean? I really can't imagine how a neck can be e.g. V-shaped. Can anyone explain this to me?

i always thought it just meant like, looking down it, If you know what i mean. Imagine looking straight down the guitar, only on the back, and what do you see. Do you see a C? (look at the C sideways) A C shape, D shape or V, but then again, i may be entirely wrong