The fundamentals of computer science are reviewed and modern personal computer hardware is described. Approaches to defining basic concepts in the field of computer science are formulated and their content is revealed. A classification of modern personal computer hardware is given and their main characteristics are given. All main provisions are illustrated with examples in which appropriate software is used to solve specific problems. Recommended for training in the discipline “Informatics”. For students, graduate students, university teachers and everyone interested in issues of modern information technology.