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Keyloggers sometimes called as keystroke logger or keylogger or system monitor.

Keyloggers main intension is to spy on your computer. It has the ability to record, store and send by email or FTP, etc.., to a desired person who installed it on your computer..

There are two types of keyloggers Hardware Keylogger, Software Keylogger

Hardware keylogger: It is a hardware device thatmonitors each keystroke a user types on a specific computer’s keyboard. As a hardware device, a keylogger is a small battery-sized plug that serves as a connector between the user’s keyboard and computer. Because the device resembles an ordinary keyboard plug, it is relatively easy for someone who wants to monitor a user’s behavior to physically hide such a device “in plain sight.” (It also helps that most workstation keyboards plug into the back of the computer.) As the user types, the device collects each keystroke and saves it as text in its own miniature hard drive. At a later point in time, the person who installed the keylogger must return and physically remove the device in order to access the information the device has gathered.