The book is the first edition containing a complete description of the PascalABC.NET programming language (version 3.5), developed at the Southern Federal University and has gained wide recognition in educational institutions. In addition to describing the language, the features of using its constructions are considered, recommendations are given on the choice of language tools depending on the problem being solved. Consideration of language constructions is accompanied by examples. The tasks at the end of each part of the book contribute to a better assimilation of the material. The texts of the programs with which it is proposed to work independently are placed in the archive file attached to the book.