computer world

                  what is computer worm   Computer worm  A computer Worm is differ from a computer viruses in that a computer worm can run itself is a virus need a host program to run, and the virus codes runs as a part of the host program. A computer worm can separate without a host program, although some modern computer worm also use files to hide inside. A computer room with self reflecting computer program from system to system without the use of a host file. It uses a network to send copies of itself to other nodes. They contain malicious code that can cause major damage to the files, software and data on a computer. There are several ways that worm can get into a computer.   what is computer worm-computer world   What is google Search Engine Logical database model and  Relational database management system Definition of computer cables and types of cables Register and type of register in computer Architecture

  What is google Search Engine Google Search Engine  Search engines are programs that search documents for specified keywords and returns a list of the documents where the keywords were found. A search engine is really a general class of programs, however the term is often used to specialty describe system like Google, Bing and Yahoo search that enable users to search for documents on the world wide web.  So a web search engine is a software system that is designed to search for information on the World Wide Web. The search result are generally presented in a line of result often referred to as search engine result page (SERPs). The information may be a mix of web pages, images and other type of files. Some search engine also mine data available in database or open directories.  dozens of search engine are available on the web. Each Search engine gathers information a little differently. Some engines scan the entire web page, other focus on the page title, while still other read keywor

 Usage of Linux and Unix LINUX operating system is great of small to medium size operations, and today it is also used in large Enterprises where UNIX was considered previously as the only option. A few years back, Unix was considered as an interesting academic project, but some big    Usage of Linux and Unix  where networking and multiple user computing are the main concern; people did not consider Linux as an option. But today, with major software vendor porting their application to Linux, and as it can be freely distributed, the operating system has entered the mainstream available option for web serving and office applications.  But there are some circumstances where UNIX is the obvious choice, used to be. If an Enterprises used massive symmetric multiprocessing systems, or system with more than 8 CPU, they needed to run Unix in the past. UNIX was far more capable in handling all all the processes more effectively can Linux. However since 2004 more of the world biggest supercompute

                    What is web browser Web Browser A web browser is a program that your computer runs to communicate with web servers on the internet. Web browser must understand HTML and display text. Web browser are interpreter of HTML language web pages are HTML document send by server on client request and after reaching this document to client side the web browser intro parrots this HTML document in graphical interface.  Web client run Special software called a browser that allow them to  Connect to an appropriate server Query the server for the information to be read.   Provided and interface to read the information returned by the server. web Browser are software installed on your PC. To Excess the you need a web browsers, such as Netscape navigator, Microsoft Internet Explorer or Mozilla Firefox. There are four leading web browser Explorer, Firefox, Netscape and Safari but there are some other browsers available now we will see these browsers in bit more detail.  Internet Expl

                What is virtual memory Virtual memory  A memory can address more memory then the amounts of physically installed on the system. This extra memory is called virtual memory. In computing virtual memory is a memory management technique that is implemented using both hardware and software. It maps memory addresses used by a program, called virtual addresses, into physical address in Computer memory. Virtual memory is a technique that allows the execution of processes which are not completely available in the memory. The main advantage of the scheme is that program can be larger than physical memory. Virtual memory serves two purpose Allow us to extend the use of physical memory by using hard disk. It allow us to have memory protection because each virtual address is translated to a physical address. The size of virtual storage is limited by the addressing scheme of the computer system and the amount of secondary memory is available in storage location. In this schemes, inst

 Computer virus  A computer virus is a small program that can copy itself and infect the system without the permission of other user. How we recognize viruses virus if It meet to criteria  It must execute itself  It must application itself, it may replace other executable file with a copy of the virus infected file.  viruses can increase their chance of spreading two other computers by affecting files on a network file system or a file system that is accessed by another computer, it can carried it on a removable medium such as a floppy disk, CD, DVD or USB drives. The term " computer virus " means is sometime used as a catch all phrase to include all type of Malware. File infected virus boot sector viruses,  Master boot record viruses, multi. participate. viruses and macro viruses. This classification depend upon their target area a mode of operation.  virus can be divided into two types based on their behavior  when  They are executed.  Non resident viruses : Non resident v

  What is buffering Buffering  Buffer is a small memory area that stores data while they are transferred between two devices or between a device and CPU or one computer to another computer via Internet it is basically used to avoid to a speed mismatch between two devices for example that a file is received via modem or storage on the hard disk but the modem is so slower than the hard disc so a buffer is created in main memory to store the bytes received from the modem. When an entire buffer is full, the buffer can be written to disk. Mean while modem still a place to store data so another buffer is created and the modem then start to fill the second buffer the first buffer is written to disk. This technique is called double buffering. So we can say that buffer is a small Storage Area used to store our information temporary to eliminate for the difference in rates of data flow between various unit of a computer.  what is computer worm-computer world   What is google Search Engine Logica

                What is internet The internet is a network of networks that connects computers all over the world.  Computer connected to the internet communicate by using the internet protocol, which slice information into packets that is chunks of data to be transmitted separately and routes them to their destination. The internet has its roots in the US military, which founded a network in in 1969  called the ARPANET, to connect the computers at the some of the colleges and Universities where military research took place. As more and more computer connected, the ARPANET was replaced by the NSFNET, which was run by the National Science Foundation. By the late of 1980 the internet has shed its military and the was available for use by the general public.  internet service providers begin offering dial up internet accounts for a monthly fee, giving users access to email and file transfer. In 1989, the world wide web was born and in the 1990, the combination of email and web. Each compu