The book by Andrew Tanenbaum, world-renowned information technology specialist, writer and teacher, published in the fifth edition, is devoted to the structural organization of the computer. It is based on the idea of ​ ​ a hierarchical structure in which each level performs a very specific function. Within this unconventional approach, the digital logic layer, command architecture layer, operating system layer, and assembly language layer are described in detail. The book is designed for a wide range of readers: both students studying computer technology and those who independently get acquainted with the architecture of a computer.