There is no conclusive response to this concern as the most common type of malware differs depending on which region of the world you lie in, and likewise changes in time. Some of the most common types of malware include viruses, worms, Trojan horses, and adware.
Infections are among the earliest and most common types of malware. https://tourismcrisis.org/?p=1110 They are programs that are created to replicate themselves and infected other computer systems. Worms resemble viruses, however they have the ability to spread out without needing to connect themselves to another program. Trojan horses are programs that masquerade as something else, such as a video game or a genuine program, however are in fact destructive. Adware is a kind of malware that shows advertising on a computer, often in a pop-up window.
Malware is constantly progressing, and new types are constantly being created. The types talked about above are some of the most typical that you may encounter.