Ключевые слова: advertising, app, audiobooks, background, banner, book, bookshelf, business, concept, convenience, design, device, digital, digital library, ebook, education, elearning, electronic, elibrary, flat, flyer, icon, illustration, information, internet, knowledge, learn, learning, library, literature, mobile, modern life, on the phone, online, phone, reading, school, screen, shelf, smartphone, student, study, technology, telephone, text, web, website,