Keystroke logging, commonly known as keylogging, refers to the practice of tracking and recording every keystroke made on a computer or mobile device. Keyloggers can be implemented through software or hardware and are often used by cybercriminals to capture sensitive information such as passwords, credit card numbers, and personal messages without the user's knowledge. While some keyloggers are used for legitimate purposes like monitoring employee activity or troubleshooting technical issues, they are more frequently associated with malicious intent. Keyloggers can be installed via phishing emails, malicious downloads, or physical access to the device, posing significant privacy and security risks.