The Internet began with the (ARPANET) system of Advanced Research Project Agency of the USA Deportment of Defense. ARPANET was the first WAN and had only four sites in 1969.
The Internet evolved from basic ideas of ARPANET for interconnecting computer, and user used research organizations and exchange information.
By 1972 there were 37 computers operating on the system and the National Center for Supercomputing (NCAA) had developed the Telnet log-on application.
The following year saw the introduction of international connections to ARPANET and the development of file Transfer Protocol (FTP).
By 1974 the Internet proper was in use.
In 1982 the Internet original NCP/IP protocols were replaced by TCP/IP and in the following year the Domain Name System (DNS) appeared.
In 1986 the National Science Foundation established NSFNet, forming the backbone of the modern Internet.
In 1990 the British programmer Tim Berners-Lee developed hypertext and HTML at CERN in Switzerland. That lead to the creation of World Wide Web (WWW).
By 1994 Web browser such as Mosaic and Netscape came into existence and one year later Microsoft introduced its Internet Explorer.
The Internet grow to become the worlds largest network.
It interconnects more the 30,000 network, allowing more then 10 million computer and more ten 150 million users in more the 150 countries around the world to communication with each other.