Every day mankind is increasingly confronted with concepts such as "smart home", "smart lighting", "smart cars", while the term "smart phone" has been adopted for years. The term "smart" is tied to intelligence, and it is well known that intelligence is a natural human characteristic. But do inanimate things like appliances and various technological devices have intelligence? The answer is no, at least as far as natural intelligence is concerned. Here it is the so-called "artificial intelligence", which is more and more present in different spheres of human life. Artificial intelligence has so far taken the guts, it is considered that for some decades some of the professions still to be performed by humans should completely disappear and thus create excess workforce. Smart robots, if they are abused, can also be dangerous. There was a case, e.g., when a robot imitated the human hand with its own motion, chose the "I'm not a robot" field and thus gained access to content intended solely for man. Artificial intelligence is certainly necessary because it greatly facilitates man's affairs but to the limit that it does not endanger human existence. The idea behind this paper is to explain and point out the usefulness of artificial intelligence and its application in different areas, but with a special emphasis on the dangers it carries with it.