Now, we all know what anti-virus software does. Or do we? Yes we do – but I am doing a blog about it anyway.

Anti-virus programs are software that protects against different kind of malicious software – or malware as it is called. Malware can be many things, and the definition is how it works and somewhat what kind of goal it has. You have your viruses, worms, trojans and many more. But they are all malware – which our anti-virus software is trying to kill.

The majority of anti-virus software operate on a signature database of virus definitions. And from this we have zero-day exploits – which means that once a threat or weakness has been discovered, the software company has zero days to patch it and send it.

There are many companies offering software out there, but one is not always be enough. They all operate with different signature databases – which means the more software you have, the more likely are you to be safe from the vast number of threats out there. I can mention a few, like McAfee, Norton and Symantec.

The anti-virus software can be set up to do scheduled scans as well as vulnerability scans on the go. For example scanning downloads, email attachments, portable storage and other files received via messaging or online.