What is the most common kind of spyware?

Adware is a type of software that is used to track a user's online activity and display screen advertisements.  https://bikramyogauk.net/?p=964 Other typical types of spyware consist of keyloggers, which are used to track a user's keystrokes, and Trojans, which are utilized to take individual info. https://cleardex.io/?p=1496