There’s a standard version of the history of the Internet that traces it back to ARPA (the Advanced Research Projects Agency) in the 1960s. ARPA developed a way for computers to exchange information in small packets, so that two computers would not need to open a permanent and exclusive channel (such as a standard phone connection) in order to remain constantly in touch. Instead, they would send messages in small chunks that could be routed through whatever computers happened to be online until they reached their destination. ARPA was a military outfit (it soon became DARPA; the “D” stands for “Defense”), and its motive was to create a new communications network that could withstand massive disruption during wartime.
The DARPA system improved, and similar processes developed separately in the academic world. Under the auspices of the National Science Foundation, these networks were brought together (starting with a process for sharing email). After a while, the NSF named this network of networks the Internet, and so we entered the current era.
This is all true and important, but it’s like explaining the origins of a human being by listing all of her direct ancestors who happen to share her last name: her father, her paternal grandfather, and so on back. Lots of other ancestors have also contributed their genes and nurture, although their names are harder to retrieve. Similarly, if you look around today’s World Wide Web, you’ll see numerous important features that did not arise from ARPA, DARPA, or the NSF.