Let's start with some basic terms and concepts: Internet: It might be helpful to think of the Internet as a vast system of roads all connecting to each other. You may. INTERNET A group of two or more devices, that are able to communicate with one another: • The telephone network: interconnection of telephones and switches. The world network of networks, Internet, is considered an inexhaustible source of information. .. "Information at your fingertips" concept. But, who would have.
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about some fundamental concepts such as networks, servers, and The internet is the largest computer network in the world, connecting. The Background and Detail for Trainer provides greater details on the content, and links to references. It will allow trainers to learn more about the topic so they . Internet concepts. This part of the module is off-line and intended as an information resource for reference use. This part of the module should be taken before.
Basics of Computer Science - Internet Advertisements Next Page Internet is a system that interconnects the different computer systems across the world. It uses the Internet protocol suite to link devices located in different corners of the world. The Internet system carries an extensive range of information resources and services including World Wide Web WWW , telephony, electronic mail, etc. Features of Internet Let us now discuss the features of Internet. Today, people located in a remote part of an island or interior of Africa can also use Internet. Easy to Use The software, which is used to access the Internet web browser , is designed very simple; therefore, it can be easily learned and used.
Routers provide datagram transport only, and they seek to minimize the state information necessary to sustain this service in the interest of routing flexibility and robustness. Packet switching devices may also operate at the Link Layer; such devices are usually called bridges.
Network segments that are connected by bridges share the same IP network prefix forming a single IP subnet. These other devices are outside the scope of this document. Common uses of the Internet E-mail The concept of sending electronic text messages between parties in a way analogous to mailing letters or memos predates the creation of the Internet.
Even today it can be important to distinguish between Internet and internal e-mail systems. During this time it is quite possible for the content to be read and even tampered with by third parties, if anyone considers it important enough.
These hyperlinks and URLs allow the web servers and other machines that store originals, and cached copies, of these resources to deliver them as required using HTTP Hypertext Transfer Protocol. HTTP is only one of the communication protocols used on the Internet. Web services also use HTTP to allow software systems to communicate in order to share and exchange business logic and data.
Software products that can access the resources of the Web are correctly termed user agents.
In normal use, web browsers, such as Internet Explorer and Firefox, access web pages and allow users to navigate from one to another via hyperlinks. Web documents may contain almost any combination of computer data including photographs, graphics, sounds, text, video, multimedia and interactive content including games, office applications and scientific demonstrations.
Through keyword-driven Internet research using search engines like Yahoo! Compared to encyclopedias and traditional libraries, the World Wide Web has enabled a sudden and extreme decentralization of information and data. It is also easier, using the Web, than ever before for individuals and organizations to publish ideas and information to an extremely large audience. Anyone can find ways to publish a web page or build a website for very little initial cost.
Publishing and maintaining large, professional websites full of attractive, diverse and up-to-date information is still a difficult and expensive proposition, however. Some commercial organizations encourage staff to fill them with advice on their areas of specialization in the hope that visitors will be impressed by the expert knowledge and free information, and be attracted to the corporation as a result.
Collections of personal web pages published by large service providers remain popular, and have become increasingly sophisticated. Whereas operations such as Angelfire and GeoCities have existed since the early days of the Web, newer offerings from, for example, Facebook and MySpace currently have large followings.
These operations often brand themselves as social network services rather than simply as web page hosts. Advertising on popular web pages can be lucrative, and e-commerce or the sale of products and services directly via the Web continues to grow. In the early days, web pages were usually created as sets of complete and isolated HTML text files stored on a web server. More recently, websites are more often created using content management system CMS or wiki software with, initially, very little content.
Contributors to these systems, who may be paid staff, members of a club or other organization or members of the public, fill underlying databases with content using editing pages designed for that purpose, while casual visitors view and read this content in its final HTML form. There may or may not be editorial, approval and security systems built into the process of taking newly entered content and making it available to the target visitors.
Remote access The Internet allows computer users to connect to other computers and information stores easily, wherever they may be across the world. They may do this with or without the use of security, authentication and encryption technologies, depending on the requirements. This is encouraging new ways of working from home, collaboration and information sharing in many industries.
An accountant sitting at home can audit the books of a company based in another country, on a server situated in a third country that is remotely maintained by IT specialists in a fourth.
These accounts could have been created by home-working bookkeepers, in other remote locations, based on information e-mailed to them from offices all over the world. Some of these things were possible before the widespread use of the Internet, but the cost of private leased lines would have made many of them infeasible in practice.
An office worker away from his desk, perhaps on the other side of the world on a business trip or a holiday, can open a remote desktop session into his normal office PC using a secure Virtual Private Network VPN connection via the Internet. This gives the worker complete access to all of his or her normal files and data, including e-mail and other applications, while away from the office.
Collaboration The low cost and nearly instantaneous sharing of ideas, knowledge, and skills has made collaborative work dramatically easier. Not only can a group cheaply communicate and test, but the wide reach of the Internet allows such groups to easily form in the first place, even among niche interests. An example of this is the free software movement in software development, which produced GNU and Linux from scratch and has taken over development of Mozilla and OpenOffice.
Films such as Zeitgeist, Loose Change and Endgame have had extensive coverage on the Internet, while being virtually ignored in the mainstream media.
Messages can be sent and viewed even more quickly and conveniently than via e-mail. File sharing A computer file can be e-mailed to customers, colleagues and friends as an attachment. It can be uploaded to a website or FTP server for easy download by others.
In any of these cases, access to the file may be controlled by user authentication; the transit of the file over the Internet may be obscured by encryption, and money may change hands before or after access to the file is given.
The price can be paid by the remote charging of funds from, for example, a credit card whose details are also passed— hopefully fully encrypted—across the Internet. The origin and authenticity of the file received may be checked by digital signatures or by MD5 or other message digests.
These simple features of the Internet, over a worldwide basis, are changing the basis for the production, sale, and distribution of anything that can be reduced to a computer file for transmission. This includes all manner of print publications, software products, news, music, film, video, photography, graphics and the other arts. This in turn has caused seismic shifts in each of the existing industries that previously controlled the production and distribution of these products.
Internet collaboration technology enables business and project teams to share documents, calendars and other information. Such collaboration occurs in a wide variety of areas including scientific research, software development, conference planning, political activism and creative writing. They may also allow time-shift viewing or listening such as Preview, Classic Clips and Listen Again features.
This means that an Internet-connected device, such as a computer or something more specific, can be used to access on-line media in much the same way as was previously possible only with a television or radio receiver. The range of material is much wider, from pornography to highly specialized, technical web casts. Pod casting is a variation on this theme, where—usually audio—material is first downloaded in full and then may be played back on a computer or shifted to a digital audio player to be listened to on the move.
These techniques using simple equipment allow anybody, with little censorship or licensing control, to broadcast audio-visual material on a worldwide basis. Webcams can be seen as an even lower-budget extension of this phenomenon. While some webcams can give full-frame-rate video, the picture is usually either small or updates slowly. Internet users can watch animals around an African waterhole, ships in the Panama Canal, the traffic at a local roundabout or their own premises, live and in real time.
Video chat rooms, video conferencing, and remote controllable webcams are also popular. Many uses can be found for personal webcams in and around the home, with and without two-way sound. It is now the leading website for free streaming video. It uses a flash-based web player which streams video files in the format FLV.
Users are able to watch videos without signing up; however, if users do sign up they are able to upload an unlimited amount of videos and they are given their own personal profile. It is currently estimated that there are 64,, videos on YouTube, and it is also currently estimated that , new videos are uploaded every day. This phenomenon began as an optional two-way voice extension to some of the instant messaging systems that took off around the year In recent years many VoIP systems have become as easy to use and as convenient as a normal telephone.
The benefit is that, as the Internet carries the actual voice traffic, VoIP can be free or cost much less than a normal telephone call, especially over long distances and especially for those with always-on Internet connections such as cable or ADSL. Thus, VoIP is maturing into a viable alternative to traditional telephones.
Interoperability between different providers has improved and the ability to call or receive a call from a traditional telephone is available. Every Website sits on a computer known as a Web server. This server is always connected to the internet. Every Web server that is connected to the Internet is given a unique address made up of a series of four numbers between 0 and separated by periods. For example, When you register a Web address, also known as a domain name, such as tutorialspoint.
We will see different type of Web servers in a separate chapter. What is Web Browser? Web Browsers are software installed on your PC. Currently you must be using any sort of Web browser while you are navigating through my site tutorialspoint. On the Web, when you navigate through pages of information this is commonly known as browsing or surfing.
We will see different type of Web browsers in a separate chapter. This server takes care of delivering emails from one server to another server. What is ISP? They are the companies who provide you service in terms of internet connection to connect to the internet.
This space will be used to host your Website. What is HTML? This is the language in which we write web pages for any Website. Even the page you are reading right now is written in HTML. What is Hyperlink? A hyperlink or simply a link is a selectable element in an electronic document that serves as an access point to other electronic resources.
Typically, you click the hyperlink to access the linked resource. Familiar hyperlinks include buttons, icons, image maps, and clickable text links. What is DNS?
When someone types in your domain name, www.