Cladograms show us points where organisms shared a common ancestor.
 

A cladogram is kind of like a family tree.

Let's see how this works.

Deinonychus © 1995 B. Cunningham; Archaeopteryx by Dave Smith, © UCMP; Grey Crowned Crane (Balearica regulorum) and Bald Eagle (Haliaeetus leucocephalus) by Gerald and Buff Corsi, © 2003 and 2004, respectively, California Academy of Sciences.