For example, what is the butterfly effect?

Butterfly effect means that in a dynamic system, small changes in initial conditions can drive a long-term huge chain reaction of the whole system.

For example, in the rain forest of South America, a butterfly kisses and flaps its wings, causing a little airflow around it, then small airflow affects big airflow, big airflow affects big airflow, and big airflow in turn affects it, and finally forms a storm in the Pacific Ocean.

The butterfly effect is used in sociology to illustrate:

A tiny mechanism, if it is not guided and adjusted in time, may bring great harm to society, and is dubbed as "tornado" or "storm"; A tiny mechanism, coupled with correct guidance, may have a sensational effect after a period of hard work.

Butterfly effect is usually used in weather, stock market and other complex systems that are difficult to predict in a certain period of time. If this gap is getting bigger and bigger, it will be very destructive.