Keystroke logging, also known as keylogging, is a method of recording every key pressed on a keyboard. This technique is often used by cybercriminals to covertly capture sensitive information such as passwords, credit card numbers, and private messages. Keyloggers can be implemented through software or hardware and may operate without the user's knowledge. While some organizations use keyloggers for legitimate monitoring purposes, they are most commonly associated with malicious activities and pose significant privacy and security risks.