1.Hardware keyloggers.
2.Software keyloggers.
what is keylogger?
A keylogger is a type of surveillance software (considered to be either software or spyware) that has the capability to record every keystroke you make to a log file, usually encrypted. A keylogger recorder can record instant messages, e-mail, and any information you type at any time using your keyboard.
such as monitoring kids works,monitoring employees and It's possible to use
to collect information of others.
refer this link to learn more best Keyloggers.
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