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A good anti-virus is crucial in order to protect your computer from online threats. However, even if you own the best anti-virus in the world, it is meaningless if you didn't update the virus definition.
Virus definition is used to detect viruses or what we called "virus signature". By using this kind of detection,anti-virus software can detect a lot of viruses that have the same signature code.
For example, let's say there are two viruses. Virus A and Virus B. Both of these viruses are in the same family. Hence, both of them are using the same signature code inside their code. Therefore the anti-virus can detect both of them. You can say that this type of detection is more accurate than the heuristic analysis detection.
Another type of detection used by anti-virus is called heuristics analysis. This type of detection however, sometimes will marked a non-virus file as one. So, it's not that accurate.
Heuristics analysis uses something like behavior monitoring and that means it monitors the suspected file behavior and see how it reacts or how it acts. There are two ways on how it monitors the suspected file. First of all, the anti-virus will check the file instruction and if the file instruction is to delete important file system, it will marked it as a threat.
Secondly, heuristic detection will put the suspected file into a virtual environment and will see how it reacts.
Updating your anti-virus definition is very important to ensure that you're protected from the latest online threats. New viruses emerge everyday and therefore, your virus definition is your asset to fight them.
Try to discipline yourself to update it every time new updates come out. There are some people who never update their virus definition from the first time they bought the software.
So, choose to protect yourself, your PC and your privacy everyday.
