I don't understand how people don't understand this theory. It's actually pretty simple for me. Something small happens, which leads to something a bit larger happening, and so on and so forth.

For those who haven't seen the movie based on the butterfly effect, go watch it. Now.

An example would be trying to stop the Hollocaust from happening, by getting into a time machine and killing Hitler long before he got to power. Kill Hitler, no Nazi leader and inspirer, different outcome of WW2 or maybe WW2 not happening all together.

BUT, if the Hollocaust never happened, what would give you a reason to go back in time to kill Hitler? And so, you would have never went back in time, Hitler was never killed, and the Hollocaust happened.

Pretty confusing, right? You're welcome.