The Internet and the World Wide Web. Una DooneySlide 2Internet and WWW What is the Internet? This is the physical infrastructure or backbone of computers,

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Presentation transcript:

The Internet and the World Wide Web

Una DooneySlide 2Internet and WWW What is the Internet? This is the physical infrastructure or backbone of computers, cables, satellites It is the collection of networks around the world that are able to communicate with each other

Una DooneySlide 3Internet and WWW The Global Communications Network Sattelites Computers Cables Servers Users ISPs

Una DooneySlide 4Internet and WWW The Word Wide Web (WWW) The WWW is a system that uses Web Addresses (URLs) to find resources when a user requests them and deliver the files to the users computer for viewing

Una DooneySlide 5Internet and WWW Surfing the WWW

Una DooneySlide 6Internet and WWW The World Wide Web It uses Hypertext and Web Browser software to deliver information –The Hypertext is the links we see in web pages that allow the user to jump from place to place (site to site) –The Browser is the software used to explore the internet

Una DooneySlide 7Internet and WWW Protocols The rules to be followed for communication on the Internet Some of these: –http (Hypertext Transfer Protocol) –URL (Uniform Resource Locator) –FTP (File Transfer Protocol) –TCP/IP (Transmission Control Protocol/Internet Protocol)

Una DooneySlide 8Internet and WWW URL Uniform Resource Locator (URL or Web Address) is made up of a number of parts or protocols First, the HyperText Transfer Protocol (

Una DooneySlide 9Internet and WWW HTTP HTTP (Hypertext Transfer Protocol) –The is the set of rules for exchanging files on the World Wide Web. filesWorld Wide Web –When activated (by mouse-clicking on a link) your request is sent to a web server –The server handles your request and transfers you to the new location

Una DooneySlide 10Internet and WWW Domain Name Second, the domain name, the address of the ISP contacted (If it is a commercial site, it ends in.com,.org means nonprofit organization). (

Una DooneySlide 11Internet and WWW Paths/Folders Third, the paths, folders, and file names of sites and their content loaded by the browser pressroom/index.htm

Una DooneySlide 12Internet and WWW FTP: Downloading Files The File Transfer Protocol (FTP) is a part of the Internet protocol suite that is able to transfer computer files between machines with widely different operating systemsInternet protocol suite computer fileoperating system This means putting a copy of the file on your computers hard drive

Una DooneySlide 13Internet and WWW FTP All kinds of files - programs, text, graphics, images and sounds - are available to be copied without restriction for non-profit purposes Must pay attention to copyright

Una DooneySlide 14Internet and WWW TCP/IP TCP/IP: (Transmission Control Protocol / Internet Protocol) is a two-layer protocol TCP is the Transport (and top) layer IP is the Address layer

Una DooneySlide 15Internet and WWW TCP The purpose is to provide transparent transfer of data between end users transferdata It manages the breaking down of a message or file into smaller packets that are transmitted over the Internet The packets are received by a TCP layer that reassembles the packets into the original message

Una DooneySlide 16Internet and WWW TCP Not all packages travel the same route to their destination but are routed in the most efficient way to their destination

Una DooneySlide 17Internet and WWW IP The Internet Protocol, handles the address part of each packet so that it arrives at the right destination address Each computer connected to the Internet must have an IP address ( ) Domain Names are matched with IP addresses in order to route datawww.itsligo.ie

Una DooneySlide 18Internet and WWW People Tim Berners-Lee –developed the system of hyper-linking Mark Andreesen – developed the first web browser

Una DooneySlide 19Internet and WWW The Internet Success Factors The emergence of the Internet is due to four factors: –The universal TCP/IP standard –The web-like ability to link from site to site –The ease of use provided by the browsers graphical interface –The growth of personal computers and their LANs connected to the Internet

Una DooneySlide 20Internet and WWW Today Millions of computers worldwide are connected to the Internet Millions of dollars/euro spent every day online Millions of people do business and communicate on it every day

Una DooneySlide 21Internet and WWW Uses of Internet and other forms of communication such as Chat Rooms Conferencing/Meetings E-commerce/Shopping Research/Education News in real-time