Keylogger malware is a dangerous threat to a PC user’s privacy. It will track your keystrokes and save them in a hidden file on your computer. After a certain amount of time, the file is sent to the hacker automatically, who will use the keystroke data to get your passwords or personal and business information. Keyloggers often enter computer systems as trojans, disguised as a free or useful app or download,and can install itself when users are clicking and browsing the Internet or downloading software.