How the Internet Works

1. What is the internet? 
The internet is the world's biggest wide area network (WAN). There are millions of smaller networks that make up the internet. Everything that you can find online comes through the internet. Today there are over 2 billion people who use the internet, and before the 1990's there was a very small amount of people that used the internet. 
2. What is a protocol?
Protocols can control or enable the connection, communication, and data transfer between two computing endpoints. ARPANET was the first network protocol that was established in 1969. 213 computers were connected to the network by 1981. TCP/IP became the new standard that networks used to exchange data in 1983. TCP stands for Transmission Control Protocol and IP stands for Internet Protocol. They both use sets of rules to exchange and recieve messages on the internet. 
3. What is DNS? 
Domain Name Service (DNS) is required to translate domain names. There would be no internet communication without DNS. DNS is the internet version of a phone book. It can look up a host name and return an IP address. Each part of the internet has DNS servers. Applications can send a request known as DNS lookup to the computer's DNS server.