How Do Antivirus Work?
Have you ever wondered how antivirus works? What determines its efficiency? We
explain this, and also, the correct way to use them.
Antivirus programs are very powerful and quite important for Windows computers , as
they offer us a protection strategy to avoid infections by viruses and other types of
malicious software while browsing the Internet or sharing storage devices such as pen
drives . Today's antiviruses are advanced and capable of detecting almost
any malware , such as keyloggers , Trojans, worms, adware, and spyware . They are
also capable of solving the problem by preventing your PC (or any other device) from
The first antivirus appeared in the 80s, and they were quite different from what we
have available today. The first big difference is that they used to only detect one type
of computer virus, and did nothing else. They are now able to detect various types
of malware and can also do whatever it takes to remove them. But how?
Antiviruses work in the background checking every file that is opened on the computer
where they are installed . For example, if you want to run an .EXE file, it does not open
immediately until the antivirus checks it and compares it with a database that contains
all known viruses, worms and other types of malware to date. This process happens
in a few seconds, which makes it highly efficient. For this same reason, you must
always have your antivirus updated, so that it is up to date against all recently
The antivirus also has another mechanism to check if a file is malicious: it is
called heuristic checking , which consists of determining if a file has a "bad behaviour"
or does not work as it should, which could indicate the presence of a new virus that it
has not yet been identified and it is not in the database. Of course, more than once
this causes false positives.
You can always use an antivirus without running in the background in case it seems
to you that i