Although almost all books concerning complex systems mention chaos and fractals, I suspect that not all fractals are complex systems.I have already explained chaos and complex systems. So, first I must explain what fractals are.

Although the science of complexity is in fashion, there is almost no agreement on what the complex system is. In this article, I would like to suggest a working definition of the complex system: indeterminate determination.In order to understand the complex system, you must understand two concepts: complexity and system.

Chaos is not a mere disorder. What is chaos, then? Let's consider why chaos does not result in skepticism, though it is neither non-linear nor indeterminate.