Answer:
Spyware.
Step-by-step explanation:
Demi surfs through many websites to find new, interesting games because she loves playing online games. Consequently, she finds that her mailbox is filled with emails suggesting websites for online games and ads promoting a few online offers. In this scenario, a spyware tracks Demi's computer behavior to send her targeted mails and ads.
Spyware can be defined as a software application or program that covertly obtains or gather informations from a user's digital device activities such as username, password, email, credit card data, website history, and transmits (reports) it to another user.