Introduction to Internet.
Today we live in a world of technology, where internet spins a web of interconnectivity around the globe. Through internet more than fifty million people in countries around the world have been connected. Internet was evolved in 1969, under the project called ARPANET (Advanced Research Projects Agency Network) to connect computers at different universities and U.S. defence. Soon after the people from different backgrounds such as engineers, scientists, students and researchers started using the network for exchanging information and messages.
In 1990s the internet working of ARPANET, NSFnet and other private networks resulted into Internet. Therefore, Internet is a global network of computer networks’ . It comprises of millions of computing devices that carry and transfer volumes of information from one device to the other. Desktop computers, mainframes, GPS units, cell phones, car alarms, video game consoles, are connected to the Net.
World Wide Web.
History of World Wide Web:
The World Wide Web was invented by Tim Berners-Lee in 1989, in 1995 the first connection was established over what is today known as the internet.
By the end of 1990, the first Web page was served. In April 1993, the World Wide Web technology was available for anyone to use on a royalty-free basis.
Since that time, the web has changed the world. It has perhaps become the most powerful communication medium the world has ever known.
A global web of computers known as the Internet, allows individuals to communicate with each other often called the world wide web. The Internet provides a quick and easy exchange of information and is recognized as the central tool in this Information Age.
Definition of WWW:
The World Wide Web (WWW) is an internet based service, which uses common set of rules known as protocols, to distribute documents across the Internet in a standard way.
The World Wide Web. Or ‘Web’ is a part of the Internet. The Web is viewed through web browser softwares such as Google chrome, Internet Explorer, Mozilla Firefox etc. Using browsers one can access the digital libraries containing innumerable articles, journals, e-books, news, tutorials stored in the form of web pages on computers around the world called web servers-Today thousands of web pages/websites are added to the WWW every hour.
Difference Between Internet and WWW:
The Internet is known as “interconnection of computer networks”. The Internet is a massive network of networks. It connects millions of computers together globally, forming a network in which any computer can communicate with any other computer as long as they are both connected to the Internet. Information that travels over the Internet does so via a variety of languages known as protocols.
The World Wide Web, or “Web” for short, or simply Web, is a massive collection of digital pages to access information over the Internet.
The Web uses the HTTP protocol, to transmit data and allows applications to communicate in order to exchange business logic. The Web also uses browsers, such as Internet Explorer or Firefox. to access web documents called Web pages that are linked to each other via hyperlinks. Web documents also contain graphics, sounds, text and video.
What is Search Engines:
Search engines are the programs which are needed to extract the information from the internet. They play a very important role in our daily routine. as today for each and every information we are dependent on internet.
Web search engines work with the help of two programs, Spider which fetches as many documents as possible. Another program, called an indexer, reads the documents and creates an index based on the words contained in each document. Each search engine uses an algorithm to create its indices such that, only related results for specified keywords is stored and returns a list of the documents where the keywords were found.
A Search Engine Works in the Following Order:
Web crawling: Web search engines work by storing information about many web pages. These pages are retrieved by the program known as web crawler – which follows every link on the site. Web crawler may also be called a web spider.
Indexing: Indexing also known as web indexing, it stores data to facilitate fast and accurate information retrieval.
Searching: A web search query fetches the result from the web search engine entered by the user to meet his information needs.
Few search engines available are as follows:
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