This textbook is designed to learn how personal computer operates. Easy-to-understand, in plain English it will teach you how to work with Windows operating system (desktop, working with windows, files and folders, customizing and others), with the Microsoft Word word processor (ribbon interface, character, paragraph and page formatting, using styles, searching, check spelling and others), with the Excel program (formatting, using formulas and functions, charting), and with PowerPoint (creating presentations). The necessary information is presented on how to use the Internet and electronic mail. Glossary of computer terms is provided. The textbook can be used both in the universities and at schools. It will be helpful for all who are interested in “computer English” and want to study personal computer fundamentals, who is eager to read and understand English language texts on personal computers and learn computer vocabulary.