Internet service is the interaction of two programs to exchange information between them. Almost all services work on the principle of “client-server”. One program – “client” forms a request and sends it to the second “server”. The server processes the request and generates and sends a response to the client. If the service is a service, then the server is the one that provides the service.
There are a large number of Internet services. They are mainly divided into standard (public) and special (available to a limited number of users).
Internet services include:
Web
Web forums
Blogs
Wiki-projects
Online shops
Online auctions
E-mail and mailing lists Newsgroups (mainly Usenet)
File sharing networks
Electronic payment systems
Internet radio
Internet television
IP-telephony
Messaging systems
FTP servers
IRC
WWW service (World Wide Web – World Wide Web). WWW is a single information space consisting of hundreds of millions of interconnected hypertext electronic documents stored on Web servers. Individual documents of the World Wide Web are called Web pages. Groups of thematically united Web-pages form a Web-node (slang term – Web-site, or simply site). A Web page is a text file containing a description of an image of a multimedia document in the hypertext markup language – HTML (Hyper-Text Markup Language). The page may contain not only formatted text, but also graphic, sound and video objects.
The most important feature of Web pages is hypertext links. Any fragment of text or, for example, a picture can be linked to another Web document, i.e. a hyperlink can be set. In this case, when you click with the left mouse button on the text or picture that is a hyperlink, a request for delivery of a new document is sent. This document, in turn, may also have hyperlinks to other documents. Thus, a set of a huge number of hypertext electronic documents stored in WWW servers forms a kind of hyper-space of documents, between which it is possible to move.
To transfer information to the WWW, the HTTP (HyperText Transfer Protocol) protocol is used. Users browse Web pages and navigate through links using browser programs (from the word “to browse” – to view). The most popular Web-browsers in Ukraine are Microsoft Internet Explorer and Netscape Communicator.
FTP (File Transfer Protocol) service. It is a file transfer protocol, one of the first Internet services. This service allows the subscriber to exchange binary and text files with any computer in the network. Having established a connection with a remote computer, the user can copy a file from it to his computer or copy a file from his computer to a remote computer.