In a popular form, the book introduces the reader to the basic concepts and ideas of the theory of efficient and interference-resistant coding-an important direction of mathematics. Having its primary sources cryptography (the art of classifying the true content of a message), but mainly solving various problems, Information is transmitted via communication lines, coding theory and now has grown into an extensive and branched field of knowledge with its own range of objects and tasks Without setting the goal of a systematic presentation of the theory, the authors seek to reflect its main features. Content. 1. CODE - HISTORY AND FIRST STEPS2. SHIFRIES, SHIFRIES, SHIFR3. FANO CODE - ECONOMY CODE4. PREFIX PROPERTIES . OR WHERE TO GO WORK5. MORE ABOUT THE PROPERTIES OF PREFIX AND SINGLE DECODITIVENESS6. OPTIMUM CODE7. ABOUT SAFETY . NOISE AND CRIPTOGRAM WHICH CANNOT BE EXPANDED8. CODES - ANTIPODE9. HEMMING CODE10. URGENT NORMAL DISTANCE11. LINEAR OR GROUP CODES12. SYNDROME DECODATION AND MORE ON THE HEMMING CODE13. ABOUT CODES. CORRECTING NON-SYMMETRIC ERRORS14 CYCLIC CODES15. ON POSSIBLE CODE LIMITS AND PERFECT CODES1C . CODES AND DECODES 17 . VOTING18. MULTIPLE VOTE AND RID CODES - MALLER19. LATIN SQUARE AND CODES20. ADAMARA MATRIXES AND CODING21. The Challenge of Burns . MOBIUS FUNCTION AND SYNCHRONIZED CODES . 1. COMPARISON AND CLASSES OF CHECKS2. GROUPS3. RINGS AND FIELDS4. ARIFMETIC n-dimensional VECTOR SPACE5. ALGEBRA MATRIC6. TASKS AND SUPPLEMENTS .