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.