What is the most common type of malware?

There is no conclusive response to this question as the most common type of malware differs depending upon which area of the world you lie in, and also alters with time. Some of the most typical types of malware include viruses, worms, Trojan horses, and adware.

Viruses are one of the oldest and most typical types of malware.  https://romanquarterconsultation.co.uk/?p=1292 Adware is a type of malware that displays marketing on a computer, typically in a pop-up window.

Malware is constantly evolving, and brand-new types are constantly being produced. The types talked about above are some of the most typical that you might come across.