What's the difference between 2 css selectors (one using > and one not) -

I was always wondering what the difference between these 2 selectors is:

  #someID img   
 and  
  #someID & gt; IMG   
 Both are affecting the  # img  tag located inside  # someID .  
 What is the difference between any thoughts?   
 
 
  & gt;  indicates the victim of immediate nest  img  is an instant child's code  #someID . The first selector will affect  all  images  anywhere  within  # someID . Second  only  will affect children immediately.