It is an explanation of how the universe came to be. The theory is that the universe burst into existence 13.7 billion years ago from the center of a black hole. The pressure there was so intense that it kept a finite amount of matter in an infinite density and then the matter expanded out—not in an explosive bang, as the name would suggest—and then cooled down to something similar to today. This theory began with the understanding that the universe is expanding out, which suggests that it has been expanding from something smaller than what it is now.
This website explains some misconceptions, support for, and alternatives to the Big Bang theory: http://www.big-bang-theory.com/
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