Du know? then answer! Du don't then just don't!

This is quite Zufällig (or not) for Du who knows please answer it since I wanna know (duh), what is the real meaning about Japanese nicknames that usually put after their names such as -chan, -san, -kun, -senpai, -sama (example: Kagami-sama oder Yuki-chan).

have any idea? what's the differences of all?