Complexity is usually confused with the term complicated. There are many different elements, individuals, and particles in a complex system that interact with each other. They also respond to the environments. Interaction between these elements, individuals, and particles involves interchanging information and knowledge. There is no central control or a centralized processing unit in a complex system.

We are surrounded by complex systems; for example, our brain, the biosystem, immune system, traffic, the financial system, society, social media, economy, etc., are all complex systems. It can also be seen in a different branch of academics such as physics, mathematics, biology logistics, sociology, etc.

Discussions among various intellectuals reveal that different complex systems in different environments have certain things in common. They need a common methodology or a common language to be analyzed and described.

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