Many programs scan for malware using a database of known malware definitions (also called signatures). These definitions tell what the malware does and how to recognize it. If the anti-malware program detects a file that matches the definition, it’ll flag it as potential malware. This is a good way to remove known threats, but it does require regular updates to make sure the program doesn’t miss out on newly developed malware.Malicious software, or malware, is the main avenue for almost everything bad that happens on a computing device. Aside from losing a device, user error or negligence, almost all breaches can be traced back to malware.