The Internet, a revolutionary and cheap communications system that has transformed the lives of billions of people across the world, turned 30 today.
The computer network officially began its technological revolution when it fully substituted previous networking systems on January 1 1983.
Known as "flag day", it was the first time the US Department of Defence (DoD)-commissioned Arpanet network fully switched to use of the Internet protocol suite (IPS) communications system.
Using data "packet-switching", the new method of linking computers paved the way for the arrival of the World Wide Web.
"I don't think that anybody making that switch on the day would have realised the importance of what they were doing," the Daily Telegraph quoted Chris Edwards, an electronics correspondent for Engineering and Technology magazine, as saying.
"But without it the internet and the World Wide Web as we know them could not have happened."
Commenting on the historic event's impact on the world, Edwards said: "The internet means there is nowhere and no one in the world you can't reach easily and cheaply.''
Based on designs by Welsh scientist Donald Davies, the Arpanet network began as a military project in the late 1960s.
It was developed at prestigious American universities and research laboratories, such as the University of California, Los Angeles (UCLA) and the Stanford Research Institute.
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