What is Anti Virus

Antivirus software are computer programs that attempt to identify, neutralize or eliminate malicious software. The term "antivirus" is used because the earliest examples were designed exclusively to combat computer viruses; however most modern antivirus software is now designed to combat a wide range of threats, including worms, phishing attacks, rootkits, trojan horses, often described collectively as malware.

Virus scanners
Antivirus scanning software, or a virus scanner, is a program which examines all files in specified locations, the contents of memory, the operating system, the registry, unexpected program behavior, and anywhere else relevant with the intention of identifying and removing any malware.

Typically two different approaches are used to identify malware, often in combination, although with an emphasis on the virus dictionary approach.

* examining (scanning) files, etc., for known viruses matching signatures in a virus dictionary, and
* identifying suspicious behavior from any computer program which might indicate infection. This approach is called heuristic analysis, and may include data captures, port monitoring and other methods.

Network firewalls prevent unknown programs and Internet processes from having access to the system protected; they are not antivirus systems as such, and make no attempt to identify or remove anything, but protect against infection, and limit the activity of any malicious software which is present

Mobile devices Anti Virus
Viruses from the desktop and laptop world have migrated to mobile devices. Antivirus vendors are beginning to offer solutions for mobile handsets. These devices present significant challenges for antivirus software, such as:

* processor constraints,
* memory constraints, and
* definitions and new signature updates to these mobile handsets.

Mobile handsets are now offered with a variety of interfaces and data connection capabilities. Consumers should carefully evaluate security products before deploying them on devices with a small form factor.

Solutions that are hardware-based, perhaps USB devices or SIM-based antivirus solutions, might work better in meeting the needs of mobile handset consumers. Technical evaluation and review on how deploying an antivirus solution on cellular mobile handsets should be considered as scanning process might impact other legitimate applications on the handheld.

SIM-based solutions with antivirus integrated on the small memory footprint might provide a basic solution to combat malware/viruses in protecting PIM and mobile user data. Solutions based on USB and Flash memory allow the user to swap and use these products with a range of hardware devices.