This video explains what an Anti Virus is and how it functions.
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Antivirus software makes your computer less vulnerable to attacks from malicious software, or malware. While no antivirus program can make a system 100 percent safe, modern antivirus techniques address several types of threats, providing as comprehensive a protection program as possible.
The basis of most antivirus software is a database of viruses and the telltale code strings that they leave behind in infected files or systems. These codes are called virus signatures, or virus definitions.
Most antivirus software can update its database of virus information automatically from the Internet on a daily or weekly basis. This is important because an antivirus program cannot detect a virus for which it doesn’t have a definition.
Most antivirus software is memory resident, meaning it remains loaded in your computer’s memory whenever the computer is on, performing on-access scanning. Whenever the operating system accesses a file that could potentially contain a virus, the antivirus software steps in and scans the file before the operating system uses it. This process takes less than a second, so it doesn’t slow down your work very much.
When an antivirus utility finds a match between the code contained in a scanned file and the code that indicates a virus, it quarantines the infected file and alerts you.
Antivirus software can also do a full system scan upon request, checking every single file on your system for viruses. This type of scan is useful when repairing an already-infected computer.
Some antivirus programs can also identify new viruses for which they have no signature on file, by using some detective techniques called heuristics. For example, one way that some viruses infect a system is by opening every executable file and trying to write themselves to those executable files. If the antivirus software detects that a program is trying to open every executable file on the system, it sees this as suspicious behavior, and locks down the program from continuing.