Discrete mathematics is mainly used in engineering and computer fields in life, and the most common ones are cryptography, communication, software engineering, artificial intelligence, multimedia technology and so on.

The scope of discrete mathematics is quite extensive, and all branches of mathematics that study the relationship between discrete quantities are discrete mathematics. For example, more than half of algebra is discrete, so the application scope of discrete mathematics is very extensive. But mainly because of the need of computer science, "discrete mathematics" is called as a whole. In the mathematical discipline system, discrete mathematics belongs to several different branches, so it is more reasonable to limit the application of discrete mathematics to the application of computer mechanisms. Discrete mathematics is a comprehensive subject with strong theoretical and practical application, which has a good theoretical basis and the characteristics of applied science.