Digital communication refers to any message passed through digital devices and includes examples like email, texting, fax, videoconferencing. The document discusses the advantages and disadvantages of various digital communication methods, noting that while digital options allow for fast, low-cost communication over large distances, they also come with risks like technical issues, information misuse, and electronic waste. Common digital communication tools covered include email, texting, faxing, teleconferencing, and videoconferencing.