Spyware is a classification of malware that is designed with the intention of spying on (hence the name SPYware) the systems it has infected in order to potentially catch sensitive information. Adware is a classification of Potentially Undesirable Programs (abbreviated as PUPs). They are not necessarily malware, but they can come bundled with one. The function of adware is simply to spam an infected system with pop up ads with the intention of forcefully marketing to the user of the system.
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