What Is An Overbite ?

What is an overbite? 
 
Well most patients think that an overbite refers to the upper teeth being further forward than the lower teeth. 
 
But actually means is the upper teeth and the lower teeth overlapping each other more.  
 
So what we call an overbite is actually an overjet, and what an overjet is, is the space between the upper and the lower teeth in the horizontal dimension.