Ball lightning is a rare and for now very difficult to explain phenomenon. In order to be able to understand the origin and nature of the phenomenon itself, the text deals with the usual form of lightning. Attention is also paid to unusual and unusual forms of lightning, the representative of which is the ball lightning itself. In the third chapter, full attention is paid to the characteristics of ball lightning, such as diameter, color, movement and similar properties attributed to it according to eyewitness reports, which are presented through statistics of the frequency of sightings. Phenomena similar to ball lightning were also mentioned, with which it could eventually be replaced. Considering the changing and unstable nature of the phenomenon that has been dealt with, many theories have been developed on the subject, which try to explain the phenomenon. Two options crystallized, models with internal and external energy, to which a part of the text is also devoted. And finally, what is perhaps the most important for the electrotechnical profession itself, an overview of the risks and dangers that can possibly threaten from ball lightning.