3- THE ONLINE WORLD

 

The internet gives us access to resources and allows us to do things that previously took up a lot of time and required long trips.




ONLINE SHOPPING:

Is the buying and selling of products or services through an information system. 



eGOVERNMENT:

Some governments, such as government departments, provide online services to users.

Many of them require an identity card.



COMMUNICATING:

Through videoconferencing as well as chats and forums like Skype, Whatsapp, Telegram..

We can listen to live radio on online radio such as los40.com

 


SOCIAL NETWORKS:

For socialising: Facebook, Twitter, Linkedin, YouTube..

We can share and download information using apps like eMule or Ares.






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1- WHAT IS THE INTERNET?

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The internet is a global network of computers that allows lots of devices to connect to other devices through a series of communication protocols, using fibre optic cables, copper wires, wireless connections…   WEB BROWSING: Is a system of linked documents or files that are displayed in a browser. This is one of the most popular services. E-MAIL: Is a system which allows users to send messages to each other. NEWSGROUPS: Are spaces for discussing each other's topic suggested. FILE TRANSFER: Quick file transfer using FTP and file sharing on peer to peer. VOICE COMMUNICATIONS: Converts voice into data packets under IP. ONLINE: Radio, television and press. OTHERS: Shopping for a wide range of items and services.                    
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2- HOW DOES INFORMATION TRAVELS?

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  1- A user types a web address. 2- The router sends the request to the ISP. 3- The request is routed to another machine, DNS server. 4- DNS translates domain names and obtains their associated binary identifiers. 5- The IP protocol sends the information packets to the destination server. 6- The host server executes the request and returns the HTML. 7- The user’s web browser receives the information and processes in order to display.
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