Ключевые слова: advertising, background, block, browsing, business, cell, communication, computer, concept, connection, contact, correspondence, customer, design, digital, direct, direction, electronic, email, envelope, inbox, internet, letter, line, mail, mailbox, mailing, market, message, mobile, modern, new, newsletter, notice, notification, online, phone, post, private, read, receive, send, sent, sign, sms, social, symbol, technology, text, wood, word, written,