Internet and its uses
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The internet is a global network of interconnected computer networks that connects millions of devices. It allows for the exchange of data, messages, and access to shared resources between any connected devices. Some key aspects of the internet include the World Wide Web, email, file transfers, chat, and peer-to-peer services that enable sharing and communication between users around the world. Internet service providers give individuals and organizations access to the internet through connections like dial-up, DSL, cable or fiber.
Internet and its uses
- 1. Internet The internet is a network of networks.A global communications system that links together thousands of individual networks. As a result, virtually any computer on any network can communicate with other computer on any other network. These connections allows users to exchange messages ,to communicate in real time (seeing messages and responding immediately), to share data and programs, and to access limitless stores of information.
- 2. The internet has become so important that its use is considered an essential part of the computer use. In other words, mastering the internet is one of the first things you should do, if you want to get the most from your computing experience. The seeds of the internet were planted in 1869 by the Advance Research Projects Agency (ARPA) of US. Department of defence began connecting computers at different universities and defence contractors. The resultant network was called ARPANET. The goal of this early project was to create large computer network with multiple paths in the form of telephone lines that could survive a nuclear attack or a natural disaster such as earthquake. If one part of the network were destroyed, other parts of network would remain functional and data could continue to flow through the surviving lines.
- 3. APRA had second important reason for creating such a network. That is ,it would allow people in remote locations to share scarce computing resources. By being part of the network, these users could access faraway systems such as government mainframes or universities owned supercomputers and conduct research or communicate with other users.
- 4. The Internet’s Major Services The World Wide Web Electronic Mail News File Transfer Protocol Chat Instant messaging Online services Peer to peer services
- 5. World Wide Web The World Wide Web (WWW) Developed in 1993 by Tim-Berners Lee Allowed connection of documents Required a browser to read documents
- 6. Electronic Mail (E.Mail) Electronic mail (e-mail) Instantaneous transmission of documents anywhere in the Faster way to communicate than postal. Easy to access Its ability to attach data files and program files to messages You may be able to exchange audio and video messages with someone else.
- 7. NEWSGROUP News group are relatively fast way to distribute information to a potentially interested readers, and they allow people to discuss topics of common interest. They also can be a convenient channel for finding answers to questions.
- 8. File Transfer Protocol (FTP) FTP is an internet tool used to copy files from one computer to another. FTP sites provides access to many different types of files FTP site is a collection of files, including data files or program files, that are house on an FTP Server.
- 9. Public real time conversation Instant messaging Private real time conversation Peer-to-peer services Allows sharing of files among users Napster and Kazaa are examples Illegal to share copyrighted material CHAT
- 10. Stands for "Peer to Peer." In a P2P network, the "peers" are computer systems which are connected to each other via the Internet. Files can be shared directly between systems on the network without the need of a central server. In other words, each computer on a P2P network becomes a file server as well as a client. The only requirements for a computer to join a peer-to-peer network are an Internet connection and P2P software. Common P2P software programs include Kazaa, Limewire, BearShare, Morpheus, and Acquisition. These programs connect to a P2P network, such as "Gnutella," which allows the computer to access thousands of other systems on the network. Once connected to the network, P2P software allows you to search for files on other people's computers. Meanwhile, other users on the network can search for files on your computer, but typically only within a single folder that you have designated to share. While P2P networking makes file sharing easy and convenient, is also has led to a lot of software piracy and illegal music downloads. Therefore, it is best to be on the safe side and only download software and music from legitimate websites.
- 11. Internet Service Provider (ISP) Company that provides Internet access Dialup Connects to Internet through phone line Modem connects to the phone line Slow connection
- 12. Dialup High-speed access Connect through a special line 2 – 25 times faster than dialup DSL, Cable, are common
- 13. The Internet allows accessing resources The Web simplifies the Internet The Web connects documents Hypertext creates links between documents Documents are stored on a web server HTTP delivers documents
- 14. Web site is a collection of documents Document is a web page Pages are published to the web Hypertext Markup Language Creates web pages Describes how pages should look Content enclosed in tags <tag>content</tag>
- 15. Browsers Read and translate the HTML Display web content Uniform Resource Locator (URL) Address of a web page
- 16. Helper applications Plug-ins Enhance a browser’s functionality Streaming audio and video Sends the file in small chunks Chunks downloaded while others play
- 17. Streaming Audio
- 18. Site searches Large sites have an internal search Metasearch sites Search several web sites at once Sponsored links Sites pay for better search results
- 19. A Metasearch engine is a search tool that uses other search engines’ data to produce their own results from the Internet. Metasearch engines take input from a user and simultaneously send out queries to third party search engines for results. Sufficient data is gathered, formatted by their ranks and presented to the users.