Work is a kind of activity that involves physical and mental effort. Most often (but not always) the work is performed for a certain reward. Work can take place in different conditions, it can be heavy or not, it can be tense or calm. For every person who works, working conditions are very important. As a rule, work determines the social status of a person. And it is, in fact, the main engine of progress in any society. Work, as a phenomenon, is inherent only to living organisms and, above all, to human beings.