The document discusses the evolution of sales tools over time, from the megaphone in the 1600s to help salespeople amplify their voice, to the invention of the doorbell in 1831 making it easier for door-to-door sales, to the development of email in the 1970s and CRM software in 1986 to help salespeople track customers. It concludes by highlighting the rise of modern 1:1 messaging software, which has now become people's preferred way of communicating and a key tool sales teams need to adopt to connect with customers.