How did the universe come to be?

if you're going to say "god" please don't bother answering, I believe that all life forms came about through evolution, but how did the universe itself get here? i've heard about this big bang theory but i'm not really sure what it is, if anyone has any enlightenment about this, please... show more if you're going to say "god" please don't bother answering, I believe that all life forms came about through evolution, but how did the universe itself get here? i've heard about this big bang theory but i'm not really sure what it is, if anyone has any enlightenment about this, please share it with me, thank you.
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