Data Structures Trees Question:

A red-black tree is a type of self-balancing binary search tree.
In red-black trees, the leaf nodes are not relevant and do not contain data.
Red-black trees, like all binary search trees, allow efficient in-order traversal of elements.
Each node has a color attribute, the value of which is either red or black.

Characteristics:
The root and leaves are black
Both children of every red node are black.
Every simple path from a node to a descendant leaf contains the same number of black nodes, either counting or not counting the null black nodes