ANTIVIRUS SOFTWARE

Antivirus is a type of software used to secure, detect, and remove computer viruses from computer systems. Antivirus Virus Protection Software is also called. This application can determine whether a computer system has been infected with a virus or not. Generally, the software is running in the background (background) and do a scan of all files that are accessed (opened, modified, or when it is stored).
Antivirus - antivirus is now not only detect the virus. An antivirus program is now also equipped with the ability to detect spyware, rootkits, and malware - other malware. Not only that, now equipped with antivirus firewall to protect your computer from hacker attacks and anti-spam to prevent junk email and / or viruses to the user's inbox. 
 How it works 
 In general, how the virus is:

    * The detection by using virus signature database (virus signature database): The workings of this antivirus is an approach that is widely used by traditional antivirus, looking for signs of the presence of the virus by using a fraction of the virus code that has been analyzed by antivirus vendors, and has dikatalogisasi according to the type, size, power and destruction of several other categories. This method is particularly fast and reliable way to detect viruses that have been analyzed by antivirus vendors, but can not detect new viruses until the virus signature database into the newly installed system. Virus signature database can be obtained from the antivirus vendor, and generally can be obtained free of charge via download or by subscription (subscription), and / or
    * Detection by the way how the virus works: How it works like this antivirus is a new approach borrowed from the technology applied in the Intrusion Detection System (IDS). This method is often referred to as a Behavior-blocking detection. This method uses policy (policies) that must be applied to detect the presence of the virus. If there is a software behavior that is "not fair" according to the policy being applied, as well as software that tries to access the address book to send out mass e-mail to the e-mail list that is in the address book (the method is often used by virus to transmit the virus through e-mail), the antivirus will stop the process performed by the software. Antivirus can also isolate the codes administrator suspected virus to determine what to do next. The advantage of this method is an antivirus can detect new viruses that have not been recognized by the virus signature database. The drawback, obviously because the antivirus software to monitor the workings of a whole (rather than monitor the file), then the antivirus often create a false alarm or "False Alarm" (if the antivirus configuration is too "hard"), or even allow the virus to multiply in the system (if antivirus configuration is too "soft"), there was a false positive. Some manufacturers call this technique as a heuristic scanning. Heuristic Scanning technology has progressed so far that now. Some antivirus check a file with the usual definition. If the usual escape detection, then the file is run in a virtual environment. All changes made are like a virus file, then the user will be warned.
Types based on the user's antivirus
Antivirus is based on users divided into two, namely the Home User and Network / Corporate User. For home users, antivirus running as usual. For the network version (network), antivirus scans on a computer - the client computer and network drives. In addition, the update client computers in a network should not be directly from the Internet. Client computer can do upate directly from a network server.
Antivirus is based on the way get one. Free Antivirus: anti virus obtained free of charge 2. Antivirus Trial: Anti virus obtained free of charge, but given the time constraints 3. Donation antivirus: Anti-virus should be obtained to donate 4. Paid antivirus: Antivirus obtained by purchasing.

Antivirus manufacturers:

1.manufacturers:: Alwil Software 
   Product  : Avast! 
   Site :     http://www.avast.com 

2.Manufacturers :  Ansav
   Product : Ansav
   Site : http://www.ansav.com/

3. Manufacturers : Avira
    Product: AntiVir
    Site :http://www.avira.com


4.Manufacturers : Kaspersky Labs
   Product : Kaspersky Anti-Virus (AVP)
   Site : http://www.kaspersky.com

5. Manufacturers : Smadav
    Product : SMADAV
    Site: http://www.smadav.net

6.Manufacturers :Symantec
   Product :  Norton Antivirus dan Symantec Antivirus Corporate Edition
   Site : http://www.symantec.com