The US DOD researchers figured out a way to break up messages into smaller parts, and sending each part to the destination, whereupon reassembly of the original message would be possible. This is called the packet system.
In 1972, ARPANET developers created the first email message software for the purpose of communicating and coordinating projects
In 1984, DNS was introduced to give the world domain endings like .edu, .com, .gov, .org and other country codes.
A 3-way handshake
send-SYN
SYN-ACK
TCP ACK
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