"Black Swan" is an event with significant consequences that are almost impossible to predict.
The author of the "Black Swan" #theory is the American writer, statistician and former #trader Nassim Nicholas Taleb. It is based on the fact that some events can have a strong negative or positive impact, but they cannot be predicted in advance, for example, based on previous experience. Remarkably, after the onset of the Black Swan, a rational explanation can be found for it.
This theory is applicable practically to all spheres of human activity, but most often it is remembered by traders and investors for whom every significant and unexpected event can result in serious financial losses or profits. Examples of "Black Swans": the widespread development of the Internet, the September 11 terrorist attacks in the United States.