What the dealio with Israel and Lebanon?!?!?

Ok first of all, why did this whole thing start anyways with Israel bombing innocent civilians in Lebanon. Who are these Hezbollah people and how do they come into play?? Why Israel still bombing lebanon. And why is the U.S involved in this. Enlighten me with your knowledge guys!!
Update: The news is confusing because i don't know the basic stuff of the attacks!!
Update 2: Thanks a bunch guys!!
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