Ключевые слова: black, book, brain, business, color, computer, course, design, developing, digital, education, elearning, flat, function, graduate, graphics, human, icons, innovation, integrated, interactive, interactive learning, international, isolated, laptop, learning, line, linear, machine, online, outline, person, profile, school, set, skill, social, student, study, system, teacher, test, thin, training, tutorial, video, webinar,