Adware, or advertising-supported software, is any software package that automatically renders advertisements in order to generate revenue for its author. The advertisements may be in the user interface of the software or on a screen presented to the user during the installation process. The functions may be designed to analyze which Internet sites the user visits and to present advertising pertinent to the types of goods or services featured there. The term is sometimes used to refer to software that displays unwanted advertisements. Is Adware really malware or just a useful tool? In your own words, discuss in a minimum full page about what you think of it (give an example), where it can be useful, and if it, in your opinion, shouldn't be allowed.