This is probably one the biggest questions that atheists or people exploring faith have, this may be due to personal experience or the day to day negative stories filtered to us through main stream news outlets.
In most cases when the question is asked it leaves the other person lost for words or quoting a bible verse, in this case Christian apologist Dr Zacharias breaks it down into simpler everyday terms.
Hope this blesses you!
Still have questions? In the video below, another area exploring the existence of God because of the purposeful design of the universe is brought forward: