What is a keylogger?
A keylogger program does not require physical access to the user's computer. It can be downloaded on purpose by someone who wants to monitor activity on a particular computer or it can be downloaded unwittingly as spyware and executed as part of a rootkit or remote administration (RAT) Trojan horse. A keylogger program typically consists of two files that get installed in the same directory: a dynamic link library (DLL) file (which does all the recording) and an executable file (.EXE) that installs the DLL file and triggers it to work. The keylogger program records each keystroke the user types and uploads the information over the Internet periodically to whoever installed the program.
Although keylogger programs are promoted for benign purposes like allowing parents to monitor their children's whereabouts on the Internet, most privacy advocates agree that the potential for abuse is so great that legislation should be enacted to clearly make the unauthorized use of keyloggers a criminal offense.
Source: http://searchsecurity.techtarget.com/sDefinition/0,,sid14_gci962518,00.html
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