It all began in 1957 when the USSR launched the first artificial satellite called "Sputnik." In response, the US formed Advanced Research Projects Agency (ARPA) as a branch of the Department of Defense to acquire the lead position in military technology. the US wanted to be able to control her nuclear arms remotely. ARPA founded a network of computers called "ARPANET" that had a backbone of 50 Kbps and 4 hosts to make this possible. What was then referred to as ARPANET evolved into the World Wide Web, which is constituted by millions of hosts as well as backbones such as 56Kbps, 1.544Mbps, 45Mpbs, and 155Mpbs lines, plus satellite and radio connections as of today. What is essential to us, is that the web uses "codes" and "decoders" to achieve this interaction. Every web page contains special markup (codes) that determine how it looks and what it contains; and every web browser (i.e. Internet Explorer, Netscape Navigator, Mozilla, Opera, etc.) is a decoder that can read the code and produce an adequate output (i.e. what you are reading right now is an output of the code that constitutes this web page).
CONT,
No comments:
Post a Comment