Ключевые слова: abstract, app, background, banner, book, business, certificate, computer, concept, course, design, development, education, elearning, flat, graphic, icon, idea, illustration, infographic, information, innovation, internet, knowledge, learn, learning, line, mobile, network, object, online, process, research, school, science, sign, solution, symbol, teaching, technology, thin, training, tutorial, university, video, web, website, word,