Anti-virus is software that is use to detect and remove a virus on a computer system. Anti-virus software save computer from Malware, Trogan horses and computer worms.
You can stop viruses before they enter your computer. You can do this by using a good virus protection i.e. antivirus software. It will check all files for viruses. Once installed, an antivirus program can be set to work in the background. It will check all files before they enter your computer and will alert you if a virus is detected before it contaminates your system. If a virus detected, your antivirus program will quarantine or eliminate it so that it cannot harm your computer.
Be very careful to use a virus protection program that matches your operating system. If you use a Mac, use a virus protection program made especially for Macintosh computer. If you use Windows 98 or XP, select a program that has written specifically for your operating system. Don’t try to use a virus protection program that has written for Windows 95 on a window XP machine; this will cause unstable behaviour and may cause your computer to crash or malfunctions.
New viruses has written i every day. Companies like McAfee, Symantec, and Panda Software are constantly expecting new viruses and updating their antivirus software tools.