The document summarizes the history of the Internet from its origins in the late 1950s as a US military network called ARPANET, through its expansion as a research network in universities and private sector through the 1970s and 1980s, to its massive growth as a global commercial and public network in the 1990s enabled by new software, hardware, and interconnected networks. It discusses how the Internet evolved from a decentralized network focused on research and innovation to today's ubiquitous global phenomenon used by billions for communication, information sharing, and social networking. The technology has transformed our society in unexpected ways and raises new ethical issues that require examination and conceptual understanding to help guide responsible development.