After a number of mergers and acquisitions five powerful media conglomerates lead the world's content production and distribution. They operate on an international basis with subsidiaries all around the globe and engage in every imaginable kind of media industry.
Table: The World's Leading Media Companies
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(* Revenues of Time Warner only (merger with AOL took place in January 2000)
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Following the dynamics of informatised economies, the consumption habits and lifestyles if customers are of great interest. New technologies make it possible to store and combine collected data of an enormous amount of people.
User profiling helps companies understand what potential customers might want. Often enough, such data collecting takes place without the customer's knowledge and amounts to spying.
"Much of the information collection that occurs on the Internet is invisible to the consumer, which raises serious questions of fairness and informed consent."
(David Sobel, Electronic Privacy Information Center)
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The bandwidth of a transmitted communications signal is a measure of the range of frequencies the signal occupies. The term is also used in reference to the frequency-response characteristics of a communications receiving system. All transmitted signals, whether analog or digital, have a certain bandwidth. The same is true of receiving systems.
Generally speaking, bandwidth is directly proportional to the amount of data transmitted or received per unit time. In a qualitative sense, bandwidth is proportional to the complexity of the data for a given level of system performance. For example, it takes more bandwidth to download a photograph in one second than it takes to download a page of text in one second. Large sound files, computer programs, and animated videos require still more bandwidth for acceptable system performance. Virtual reality (VR) and full-length three-dimensional audio/visual presentations require the most bandwidth of all.
In digital systems, bandwidth is data speed in bits per second (bps).
Source: Whatis.com
ARPAnet was the small network of individual computers connected by leased lines that marked the beginning of today's global data networks. Being an experimental network mainly serving the purpose to test the feasibility of
In 1969 ARPANET went online and links the first two computers, one of them located at the University of California, Los Angeles, the other at the Stanford Research Institute.
But ARPAnet has not become widely accepted before it was demonstrated in action to a public of computer experts at the First International Conference on Computers and Communication in Washington, D. C. in 1972.
Before it was decommissioned in 1990,
In the USA commercial users already outnumbered military and academic users in 1994.
Despite the rapid growth of the Net, most computers linked to it are still located in the United States.
A gateway is a computer supplying point-to-multipoint connections between computer networks.
A server is program, not a computer, as it sometimes said, dedicated to store files, manage printers and network traffic, or process database queries.
Web sites, the nodes of the
TCP and IP are the two most important protocols and communication standards. TCP provides reliable message-transmission service; IP is the key protocol for specifying how packets are routed around the Internet.
More detailed information can be found
Java applets are small programs that can be sent along with a Web page to a user. Java applets can perform interactive animations, immediate calculations, or other simple tasks without having to send a user request back to the server. They are written in Java, a platform-independent computer language, which was invented by
Source: Whatis.com