The document traces the history and development of the Internet from its origins as the ARPANET network established by the US Department of Defense in the late 1950s through key developments in the 1980s such as the creation of email and the domain name system. It highlights major events and innovations from the commercialization of the Internet in the 1990s through the growth of e-commerce, social media, and mobile Internet access in the 2000s and 2010s. Major topics covered include the transition from ARPANET to the Internet, the invention of the World Wide Web, the dot-com boom and bust, and the rise of companies like Google, Amazon, YouTube and social networks.