tree 

nodes with edges 

 

types of binary tree 

1)full or strict binary tree only have 0 or 2 child of every parent

2)perfect binary tree  internal nodes have two child and leave nodes on same level

3)complete binary tree every filled is complete and all remaining keys are on  left ..

 4)Degenerate binary tree having only one child to every parent

 5) skewed binary tree 

left skewed  all childs on left

right skewed all childs on right