Origin

• All viruses are outside programs attacking a computer. They may come from an external device, such as CD, or from a website or email attachment.
  
  

Functions

• A general anti-virus program performs two tasks to stop viral attacks. One way is to scan the computer system periodically to see if a virus is contained in the system. The other way is block any incoming viral attacks in real time from websites or loopholes in the computer's operating system.
  
  

Automatic Updates

• Norton AntiVirus is run by the Symantec Corp. According to its website, the company constantly makes sure its virus definitions guard against the latest computer threats. If a new virus is emerging across the Internet, Symantec automatically updates its customers' programs to defend against the threat.
  
  

Definition

• Norton spots viruses from a number of angles. Any code that is replicating itself is usually determined to be a virus. A program that begins downloading information without the computer user's consent is usually a virus. Any executable files or files that are connected to a third party are monitored heavily by the Norton AntiVirus.