Written by the famous High-Pressure scientist of the Russian Academy of Sciences, The ABCs of High-Pressure Science contains brief information explaining the terms and concepts adopted by professionals involved in research in the field of high pressure, be it physics, geology, chemistry, or technology. The book also includes brief biographical essays describing activities of the outstanding scientists who largely determined the current state of high-pressure science. The book is organized in the form of short chapters or notes in alphabetical order, so a search of the necessary information is not difficult. The ABCs is intended for young scientists, graduate students, and students; nevertheless, well-established scientists can also find useful information here. Finally, The ABCs of High-Pressure Science is not a reference book and is designed to ensure that the reader can easily find the needed information from the Internet.