What do the Roles really mean?
I've been playing this game for years but I'm still pretty confused about what each lane exists for, outside of the historical context of previous games that had three lanes and a jungle.
Every role seems to have a large selection of champions that creates a wide spectrum of how you can actually play that role. Champs frequently go between roles. So what is actually the point of the "top", "mid" and "bot" metas?