by 
The Curious Bag
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Anti-virus software is available in both free and commercial packages and is used to defend against malicious code known as computer viruses. Although the benefits and features vary depending on what anti-virus package is used, each offers the same basic functionality.
Prevention
Active anti-virus software prevents viruses from installing on your computer system, downloading from a website or a website advertiser, and extracting from a downloaded archive.
Performance
A computer infected with one or more computer viruses will experience decreased CPU speed, resulting in slow performance, frequent errors and sometimes total operating system failure.
Scans
All packaged anti-virus applications allow regular programmed scans, which will find and quarantine any malicious executables that have secretly embedded themselves within your operating system.
Safety
Proper anti-virus software will prevent unauthorized users from accessing personal documents, records and pictures.
Reliability
With the ability to update without manual intervention and automatically monitor all network and system traffic, you can rest assured that your computer will always be safe.
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