A Fractal Tree is a concept in geometry, which refers to a type of tree that is created by splitting a line segment into two smaller segments at the end (a symmetric binary tree), and then splitting the two smaller segments in the same way, and so on infinitely. Fractal Trees have self-similarity in shape at different scales, which means that when zooming in or out a part of the tree, one can still see the same structure as the original tree. Fractal Trees can be distinguished by the angle between adjacent line segments and the ratio between the lengths of successive line segments.
Fractal Trees are not only an abstract concept, but also appear frequently in nature. For example, real trees also have branching structures similar to Fractal Trees, when from the trunk they split into many branches, and from each branch they split into many smaller twigs. The lungs, blood vessels, crystals and lightning also have similarities with Fractal Trees.
