Many reasons, more calm, better decision making, improved health. Really only one way to know and that is try it! It's a system build on personal experience and its different for everybody. As is everything, but hey, let's not get technical! Here is a snippet from Jon Kabat -Zinn to whet your appetite and if you want to more to read follow on to Ainslie Mears fabulous preface from "relief without drugs" however don't try that at home!. "Meditation is simply about being yourself and knowing something about who that is. It is about coming to realize that you are on a path whether you like it or not, namely, the path that is your life. Meditation may help us see that this path we call our life has direction; that it is always unfolding, moment by moment; and that what happens now, in this moment, influences what happens next." (Kabat-Zinn 2005)