The global computer network Internet as the world information technology system has existed for almost 40 years.
The Internet emerged as a program to increase the resilience of the US defense system in the early 1970s pp. This appearance is associated with the creation and development of the APRANET network in 1969-1977.
The Internet is a worldwide collection of technical tools, standards and arrangements that allows communication between different computer networks in the world.
The basis of the functioning of the Internet network is the basic Protocol TCP/IP (Transmission Control Protocol Internet Protocol), which is a set of protocols – systems of standards and rules of communication and transmission of information in the global network. In 1983 p. APRANET switched to the use of this Protocol, and consider the date of birth of the Internet
Since 1992, the practical use of WWW (World Wide Web-the world information web) as a more effective way to transmit information, which allowed users around the world to freely exchange data. This project was based on the use of hypertext – a method of providing information in the form of text, the individual fragments of which are connected by links that are links that allow you to easily move from one material to another.
All computers or machines, United by communication channels on the Internet, called hosts (hosts), among which there are very powerful mainframes, less powerful minicomputers and personal computers. Some of them are connected to the Internet through a provider (Internet service provider, ISP), that is, an institution that provides commercial services for connecting to the network (in domestic practice such are Uarnet, Internet Ukraine, Global Ukraine, Lucky Net) or connected to it directly.
A significant part of local networks operate in the conditions of functioning of servers – computers that provide work and provide services to other computers and programs within this network.
Servers on the functional features are subdivided into:
- files that store files used by network users;
- print servers;
- Web servers (computers responsible for storing and issuing Web pages on which server software is installed to handle requests from browser programs that use the HTTP Protocol).
- Web-browsers (browsers) – viewer WWW-pages and other resources. Modern browsers have a wide range of multimedia capabilities. The most famous of them are Netscape Navigator Microsoft Internet Explorer. They can also work with FTP protocols.