Computer virus is a program or piece of code that is loaded onto your computer without your knowledge and runs against your wishes. Viruses can also replicate themselves. All computer viruses are man-made. A simple virus that can make a copy of itself over and over again is relatively easy to produce. Even such a simple virus is dangerous because it will quickly use all available memory and bring the system to a halt. An even more dangerous type of virus is one capable of transmitting itself across networks and bypassing security systems. Since 1987, when a virus infected ARPNET, a large network used by the Defense Department and many universities, many antivirus programs have become available. These programs periodically check your computer system fro the best-known types of viruses.
How Do Computer Viruses Spread
A computer virus is a program that spreads malicious code by copying itself and infecting host computers. Although some viruses are latent, others can corrupt data or impede system performance. Many viruses attach themselves to legitimate executable files on a host computer that allow the virus to be loaded when the user opens the file. A virus generally will be activated when it is loaded into a computer”s memory, and then it may continue to spread its viral code into a number of other programs and files stored on the host computer. The computer’s programs may still continue to work normally, but also spread the virus code to other machines on the same network, or machines that use the same storage devices.
Viruses can spread by using infected physical storage devices, such as pen drives and optical disks. They also spread by getting attached to e-mail messages or by downloading virus-infected files or software from the Internet.
Software Measures To Protect The Computer System
Computer software, or simply software, also known as computer programs, is the non-tangible component of computers. Software security is an idea implemented to protect software against malicious attack and other hacker risks so that the software continues to function correctly under such potential risks. Security is necessary to provide integrity, authentication and availability. Some of the security measures for the data, information and software are data backup, password protection, virus scanning, defragmentation and scanning a disk.
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