Read chapter 1.3 pp. 16-25 in the COURSE TEXT. Go by section title to be sure you are reading the correct pages. 1.3 The Evolution of Media.
The first page of the text mentions the Industrial Revolution in the 19th century. To get a sense of the importance of the revolution, read the first few paragraphs from here: https://www.britannica.com/event/Industrial-Revolution (copy and paste)