In 1969, the first message was sent over the ARPANET, a network of universities and research laboratories across the US. This marked the start of a technology that would go on to become the ‘network of networks’ we all rely on so heavily today.
https://www.techradar.com/news/as-the-internet-turns-50
https://www.techradar.com/news/as-the-internet-turns-50