DC World Wide

The Best & Higher Education For All


Today is Happy Day

Know More !


What is Internet?1

pInternet is a global network connecting millions of computers. Unlike online services, which are centrally controlled, the Internet is decentralized by design. Each Internet computer, called a host, is independent. Its operators can choose which Internet services to use and which local services to make available to the global Internet community./p

What is a Minicomputer?2

pA Minicomputer is a midsized computer. In size and power, minicomputers lie between workstations and mainframes. In general, a minicomputer is a multiprocessing system capable of supporting from 4 to about 200 users simultaneously/p

What is a Mainframe computer?3

pMainframe computer is a very large and expensive computer capable of supporting hundreds, or even thousands, of users simultaneously/p

What is E-mail?4

pE-mail is a short form for Electronic mail. It is the transmission of messages over communications networks/p

Is there any difference between the Internet and World Wide Web?5

pMany people use the terms Internet and World Wide Web interchangeably, but in fact the two terms are not synonymous. The Internet and the Web are two separate but related things.br / The Internet is a massive network of networks, a networking infrastructure. 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.br / The World Wide Web, or simply Web, is a way of accessing information over the medium of the Internet. The Web uses the HTTP protocol, only one of the languages spoken over the Internet, to transmit data. The Web also utilizes browsers, such as Internet Explorer or Netscape, to access Web documents called Web pages that are linked to each other via hyperlinks. Web documents also contain graphics, sounds, text and video. br / The Web is just one of the ways that information can be disseminated over the Internet. The Internet, not the Web, is also used for e-mail, which relies on SMTP, Usenet news groups, instant messaging and FTP. So the Web is just a portion of the Internet, albeit a large portion, but the two terms are not synonymous and should not be confused/p

What is World Wide Web?6

pWorld Wide Web is a system of Internet servers that support specially formatted documents. The documents are formatted in a script called HTML (HyperText Markup Language) that supports links to other documents, as well as graphics, audio, and video files. This means you can jump from one document to another simply by clicking on hot spots. Not all Internet servers are part of the World Wide Web. br / There are several applications called Web browsers that make it easy to access the World Wide Web. Two of the most popular being Netscape Navigator and Microsoft's Internet Explorer/p

What is a Browser?7

pA browser is a software application used to locate and display Web pages. The two most popular browsers are Netscape Navigator and Microsoft Internet Explorer. Both of these are graphical browsers, which means that they can display graphics as well as text. In addition, most modern browsers can present multimedia information, including sound and video, though they require plug-ins for some formats/p

What are Cookies?8

p"Cookies" are pieces of information that a Web site transfers to your computer's hard disk for record-keeping purposes. "Cookies" can make the Web more useful by storing information about your preferences on a particular site, such as your preferred chart settings. The use of "Cookies" is an industry standard, and many major Web sites use them to provide useful features for their customers. "Cookies" in and of themselves do not personally identify users, although they do identify a user's computer. Most browsers are initially set to accept "Cookies". If you'd prefer, you can set yours to refuse "Cookies". However, you may not be able to take full advantage of a Web site if you do so/p

What do we mean by a Protocol?9

pA Protocol is an agreed-upon format for transmitting data between two devices. br / There are a variety of standard protocols from which programmers can choose. Each has particular advantages and disadvantages; for example, some are simpler than others, some are more reliable, and some are faster. br / From a user's point of view, the only interesting aspect about protocols is that your computer or device must support the right ones if you want to communicate with other computers. The protocol can be implemented either in hardware or in software/p

What do you mean by Hyperlink?10

pAn element in an electronic document that links to another place in the same document or to an entirely different document. Typically, you click on the hyperlink to follow the link. Hyperlinks are the most essential ingredient of all hypertext systems, including the World Wide Web/p

What is the difference between FTP and HTTP?11

pFile Transfer Protocol, or FTP, is a protocol used to upload files from a workstation to a FTP server or download files from a FTP server to a workstation. It is the way that files get transferred from one device to another in order for the files to be available on the Internet. br / In contrast, Hyper Text Transfer Protocol, HTTP is a protocol used to transfer files from a Web server onto a browser in order to view a Web page that is on the Internet. Unlike FTP, where entire files are transferred from one device to another and copied into memory, HTTP only transfers the contents of a web page into a browser for viewing. FTP is a two-way system as files are transferred back and forth between server and workstation. HTTP is a one-way system as files are transported only from the server onto the workstation's browser. When http appears in a URL it means that the user is connecting to a Web server and not a file server. The files are transferred but not downloaded, therefore not copied into the memory of the receiving device/p

What are search engines?12

pA search engine is a piece of software that looks up information on the Internet for you just like a librarian would help you locate books in a library. It would find the sites with the phrase you ask in a jiffy and it would look up all of the Internet libraries for you/p

What is a computer virus? Why is it called a virus?13

pA computer virus is a programme or software with a set of coded instructions to carry out the desired disorder and destruction, as also to replicate it. Though non-living and artificially created, the computer virus has marked similarities with its biological counterpart, and hence the name. Both forms of viruses contain coded instructions to carry out a set of activities, when certain specified conditions are met. Each computer virus has its specific signature. Both of them invade and replicate only in a host. Both of them can be detected and "vaccines" can be prepared/p