Roles of adc, jungle and etc.
I'm new to the game and all I know is that there are 3 lanes to pick, but I still don't understand the whole concept about adc, jungle and other roles (not sure if there are more). I understand that adc gets the highest damage and dies easily, but what about jungle? All I know is that he takes care of the monsters, but wouldn't that be too early? Why do these roles matter? And what other roles are there, and what do they do?
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Ganking potential means
's Ult, Cataclysm, is a great example. If he keeps your target behind the walls (quite hard to do, since his wall's made out of painted cardboard), you have plenty of time to engage.