The spyware technology is by far infused into the database without the owner’s awareness or consent, however, they come in as “drive-by downloads” or the user goes to click in options in “pop-up” windows, and immediately detoured to some other programs, either pornographic, or anything else without essence.
The adverse effect of adware is the fact that when it is installed in the computer and the user consents to include tracking features, it automatically becomes a “spyware” when used by another user who interacts with the “adware” outside any database link.