Antivirus software is a computer program that finds and eliminate viruses and malicious software. Antivirus software uses two different techniques to do this. There are many different types of antivirus software and the best anti virus software is one that is constantly updating.
First it examines files to look for known viruses. It also identifies suspicious behaviour from any computer program that might be infected. When the antivirus finds the virus in the dictionary of viruses it tries to fix the file by removing it from the file. If the antivirus can't remove it then it will try to quarantine the virus so the file cannot be touched by other programs and won’t spread. If it can’t do this then it will delete the file.
There are some antivirus software programs that are free. You can find a free antivirus software download the avg web site. Avg has both a paid version and an avg free anti virus software.
Another good anti virus existing right now is the Norton anti virus software, which can also be purchased on the Norton web site. You can also find a free trial of free Norton antivirus software on their web site.
