ransomware, an attempt to blackmail a user into making a payment. Sometimes they encrypt documents and will not decrypt them until a ransom is paid., spyware/keylogger, a program that monitors user activities (such as websites visited, usernames and passwords used) and sends this information back to a hacker., virus, this can copy your personal data, delete your files or slow your device down. It spreads by duplicating and attaching itself to other files, trojans, harmful software often hidden in downloads such as free online computer games, worms, like a virus, cops itself and can delete files or send emails to everyone in a user's address book, adware, software that displays unwanted (and sometimes irritating) pop-up adverts on screen.

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