Numerous publications on discrete mathematics are published worldwide, which seek to explain the basic mathematical principles and are mostly written with a high degree of difficulty, aimed mainly at professionals or educators and focused more on theoretical bases than on specific applications. In our publication, each key mathematical concept is explained using specific applications. Therefore this popular publication is intended not only for graduates of different types of schools but also for life and practical application outside academia and for anyone who wants to be informed, in a comprehensible manner, of key knowledge pertaining to computer science.