What is computer virus,types of computer virus, symptoms of computer virus, prevention of computer virus;

what is computer virus?

The term computer virus was first formally defined by Fred cohan in 1983. A computer virus is a computer program that can copy itself and effects a computer without the permission or knowledge of the user.

 Awareness can sides of a set of instruction that attach itself to other computer programs usually in the computer's operating system and become a part of them. A virus is usually designed to execute when it is loaded into a computer's memory. Virus spread when the software or document get attached to or transfer from one computer to another using a network are these files are in method or thug in affected email attachments.

Types of viruses

File infector virus: 

some file infector viruses attach themselves to program will usually selected.com for the .exe file.

Macro virus:

These viruses specifically target macro language commands in application like Microsoft word and other programmes.

Overwrite Virus

some viruses are designed specifically to test of file or applications data. after infected a system and override varicose vegan over writing file with its own code scan target is file or applications or systematically overwrite or file on and infected device.

Polymogrphic viruses: 

A polymorphic graphic virus of type malware that has the ability to change or muted in underlying code without changing its basic function of feature.

System or boot record infactors: 

These virus infect executive all code found in certain system areas on a disk. The attached to the DOS boot sector on this cat and USB thumb drive or the master boot record or hard disk.

Symptoms of computer virus infection:-

We can observe some symptoms if a computer is infected affected from the viruses. Some of the symptoms are listed below.

• A computer program may disappear form its memory itself.
• Unwanted music or sound unexpectedly start playing through the speaker.
• Icons and programs may disappear from the desktop.
• Previously installed anti-virus program will suddenly disabled and cannot be restarted.
• File that have been recently opened certainly have more than one extension such as .exe .vbs .GIF or JPG.
• Unnecessary dialogue book and menus may appear on the screen.
• Items are not printing correctly.
• Disc drivers and disks became inaccessemble.
• An application or application may not working correctly.
• The computer is not running as well as usual or the computer reboots on its own.
• The speed of the computer will slow down.

Prevention from computer viruses:-

As you we know that computer is an essential tool for us. The documents that are stored on computers are very important for the user. A computer virus may damage our data program software and even hardware component at any time. For this we can't you some prevention measures that are given blue to protect our computer from viruses.

1. Install antivirus software and update it regularly.
2. Do not use private software for which you have not paid.
3. Always scan removable storage device such as pendrive hard disk memory card it is before using it.
4. Do not open unnecessary email and browse websites.