The internet was originally designed to support communication between scientists and the military.
Web 1.0 was created for the ARPA (now DARPA). The adoption by APRANET of the Transmission Control Protocol/Information Control (TCP/IP) invented by Bob Kahn and Ben Surf, which specifies how information is grouped into packets and routed around the internet in a dynamic, decentralized way, led to the birth of the modern internet.
In this early instantiation of the internet, there was no consideration of privacy and security. The internet grew so quickly that it quickly became impossible to do anything but duct tape on considerations for privacy and security (the NSF tried some years ago but failed).
Web 2.0 supports information discovery, e-commerce, and information sharing. Amazon was an early online retailer, joined quickly by eBay. The advent of social networks (LinkedIn: 2002, Facebook: 2004, Twitter: 2006, Instagram: 2010, Pinterest: 2010, Snapchat: 2011, TikTok: 2017) revolutionized the web by allowing users to generate content. It is not hyperbole to say that the ability of everyday people to publish on the web is as impactful as the development of the printing press.