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• As you have seen that normally the antivirus take the content or signature of a file or program to compare it with its database, now what if the database of an antivirus is not updated and if any new malware try to exploit your computer and your antivirus don’t identify it because it has no information about. So the new threat can easily bypass your antivirus and will cause a harm to your computer, this is called Zero-day threats.

• Awareness among the user(s) is/are very important rather than antivirus software’s, you should teach your self on how to be safe on the jungle of web where every day, is the day of new threat.
• You must be aware about the viruses and their effects and how they spread.
  • Malware: Virus
• Do not download and run the unknown programs from Internet.
• You should know how to secure yourself from malware.
  • Secure Your Self From Keylogger 
• You must know about the latest antivirus software for your operating system.
  • 4 Antivirus For Android 

So these are two main ways employed by the antivirus to detect the unwanted files. So now always when you run a scan you would know what is happening.