I have to admit, I am not very knowledgable when it comes to optics. Could someone please explain to me what is parallax, and how does it effect my shooting? Thanks....Flinch

I have to admit, I am not very knowledgable when it comes to optics. Could someone please explain to me what is parallax, and how does it effect my shooting? Thanks....Flinch
Here you go flinch.http://www.leupold.com/resources/MyInfo81/Answerbook/Answers/10.aspx

Thanks, thats kinda what I thought but wasnt sure.