Monday, 3 October 2011

Information Retrieval through WWW 
The Word Wide Web is the most rapidly growing , easiest to use ,and most popular method of communicating on the Internet. It’s form developed recently (within past three years ) for presenting and retrieving data on the Internet in formats other than the simple text. Information on the World Wide Web is presented graphically as well as textually in a form referred to as pages (Web Pages) . To view pages on the World Wide 
Web, a software called browser (Internet Client) is used. The most popular browsers used all over the world are Microsoft Internet Explorer, Netscape Navigator, Mozilla firefox, Opera etc. 
To access the pages on the web, all you need to know is the URL (uniform Resource Locator) of the site you wish to access, type it in the ‘address bar’ of the browser and press enter. 
You can access sites all over the world. You can connect from your desktop to thousands of Web servers simply by “clicking” on a link or by entering a specific address. 
You can contact to many different types of system – and not be aware of the differences. You can access many different types of information – text, images, Audio, Video, computational services- again usually with no extra work on your part. 
You are using a single Web-browser to do this. One tool accessing many different types of systems information across the world. 
Web and Internet: 
The basis for the Web is the Internet. The Web is built on the Internet , and makes use of many of the mechanisms the internet provides. 
The Internet is the physical aspect – computers , networks. It allows us to connect to thousands of other computers across the world. But it does not mean that those systems users can look at , and understand , the information there. 
The Web was developed with the concept of “universal readership”.It is an abstraction and common set of services on to of the Internet . It is the set of protocols and tools that let us shame information with each other. 
E- mail 

On the Internet we commonly use the word MAIL to refer to E-mail. Anyone who has a mail addresses can send you mail. Similarly if you have someone’s mail address you can send him/ her mail. 
To send mail you use your mail program to compose a massage When you are finished you tell your program to send the massage. Your program contacts the server and send it. The massage. The server then deliver the massage to the recipient’s server. 
E-mail now provides you with the ability to attach different types of file such as audio video, Text etc. 
Downloading refers to the method by which you access digital information from a remote computer. As it turns out, almost everything you do on the Web is some form of downloading and it’s as simple as clinking your mouse. When you access a web page, for instance, you are actually downloading the document and all its associated graphics from a web server. 
There are plethora of web sites on the web, which provide links for downloading files store on servers to your computer. So you can get a copy of some file or piece of software, by just liking the provided link. 
Use Net(Newsgroups) 
Use Net refers to a service that ‘s very much like a public bulletin board. UseNet allows you to post messages to a public subject area, a news group, where a number of other newsgroup participants can read them and post their won replies and comments. 
UseNet is an immensely popular Internet service that has grown to include thousands of topics that users post messages and responses to: these topics range from books and movies to religion and philosophy to computer technology. 
In newsgroup you can find job posting, business and healthcare advice, political and religious discussion – even photos you can download. 
Chat/Instant Messaging 
In our fast-paced world, sometime even the rapid response of e-mail is not fast enough. You have no way of knowing if the person you are sending e-mail to is online at that particular moment or not. Also, if you are sending multiple e-mails back and forth with the same person , you normally have to click through a few step to read, reply and send the e-mail. This is why instant messaging has gained popularity. 
Instant messaging allows you to maintain a list of people that you wish to interact with you can sent messages to any of the people in your list , often called a buddy list or contact list , as long as that person is online. Sending a message opens up a small window where you and your friend can type in messages that both of you can see. 
FTP: Internet file transfer Protocol 
The FTP service lets you transfer files from one Internet computer to another. 
Telnet is a service that allows you to a remote computer and run programs. Telnet was the first service developed for the Original Arpanet. In those days the only way to use a computer interactively was via a device called terminal tel net was devlopped to allow people to log in and use a remote computer over a network 
Search Engine 

A Search Engine is a programme that can search a large database for specific information available over internet. On the web there are a number of search engines devoted to keeping track of everything on the web, and you can use them for free. Each search engine is different and you must learn to use it in its own way. Google, Yahoo, Alta Vista are examples of Search engine. 
Finding people on Internet 
Finding people online isn’t as easy as might think . Despite the proliferation of people finders , white pages , and email directories , your chances of finding the person you seek are slim if you approach the task with a casual attitude. 
The problem is compounded if you’re searching for someone who lives outside north America , where most of the major people finders are located . fortunately , local and regional people directories are becoming more available . 


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