مرحبا هي بحث عن الانترنت الاستخدامات والايجابيات والسلبيات
The Internet began in the United States of America (USA) in the 1960’s. It is funded by the Ministry of Defense & was used to send/share information from computer to another computer using the telephone lines. From this, it has exploded into the widest used entertainment, information, research and communication resources service there is to date.
The Internet is one of the youngest and fastest growing media in today's world. Internet growth is still accelerating, which indicates that the Internet has not yet reached its highest expansion period. Furthermore, we should make clear the distinction between the stock and the flow of information. While web sites and some portion of email messages are being stored and accounted for under different storage categories, there are other "components" of what we know as "Internet," such as Internet Relay Chat (IRC) or Telnet, which exist only as a flow of communication. What makes the Internet extremely successful is that it is one of a handful of media (such as radio and TV), where one unit of storage might generate terabytes of flow, as opposed to books and newspapers, where one exemplar is usually read by one or two people, and the flow of information is relatively low.
Uses of the internet
1- World Wide Web
The WWW is made up of interactive and graphical tools that provides for the exchange of information and ideas. The www is actually conceived as a way for physicists to share their data. In 1998 Tim Burners – Lee led a team in Switzerland to develop the initial idea. Key among these was hyperlink or “hot” portions, an online services which, when selected, takes the user to a related or “linked” site i.e. if the user were reading about dinosaurs on the WWW and selected the hyperlink world “tyrannosaurus” he would then go directly to a link dealing specifically with that species.
Every computer needs an Internet Service Provider (ISP) browser to assess the WWW. With the browser one can navigate through the web, also it allows one to go back and forward through web page visited. Other functions available in the browser which the WWW needs are:
• Hyperlink\ hotlink – is clicked on for – sponsors and other reference page and some downloads – music, video clips, software • Bookmark/holists/favorites – the address of favorites sites
Today several web browsers are available for IBM and Macintosh based computers and most of the major online services include web browsers in standard packages.
The WWW is so easy to use one simple has to point the cursor and click on one’s browser, which also allows web pages to be viewed through any computer which is connected to the internet and has a browser. It also makes the ability for software and data files easy to download. Hyperlinks and multimedia are two outstanding aspects of the WWW.
2- Electronic Mail (E-Mail)
E-mail is the widest used service today; its main purpose is to send computers or electronic massage to another Internet users account. The computer sends the massage via telephone lines to the server where the message is stored in a remote computer or the receiver account, until the receiver comes online. It allows a person to send messages, files, and pictures just about anything imaginable to another person anywhere in the world so long as that person has an account.
3- File Transfer Protocol (FTP)
The main purpose of ftp is to download files from a distant computer and place them onto own hard disk. Whether or not a file is available for download depends on two things:
Whether one is allowed to download files to the hard disk of the computer in use & whether the desired file is available for copying.
Whether or not the user is permitted to download files to the computer may depend on the availability of disk space, which is low in some cases. However those using their own PCs may do whatever they like.
Most computer files need the user to have an account on that computer, plus a password. However, all kinds of files, programmer, graphic, and even sounds are available to be copied without restriction. There are two main ways to use FTP:
Non-anonymously –Account with a user ID and password, which gives more privileges than with anonymous access, is set up.
Anonymous – instead of§ setting up an account one simply calls his self anonymous and uses the e-mail address as a pass word.
Email is also one of the methods to send files however it would not be appropriate to send large files through e-mail. Information is not available from any other source; such as photographs of NASA may be available using the FTP. Something that one would get any other way, such as photographs of NASA or games software, etc. or maybe even the user does not know what they want but knowing all the free FTP out there they just want a look around and download things.
A newsgroup is an informal network of computers that allow the posting and reading of messages on specific topics. Discussions cover almost any subject etc herbal remedies or Chinese politics it is possible to find entire groups who share the same interest and have something to say about it. Today there are more than 10,000 newsgroups; all of them offer conversations and some offer files to download.
The best way to get started in using newsgroups is to read the posted massage in one’s chosen subject. This is called “lurking” enable the “lurker” can assess the group before tacking part.