A key logger (short for “key logger”) is a software or hardware tool that records the keys pressed on a keyboard, capturing the characters typed by a user.

The collected data can include passwords, messages, personal information, and any other text entered on the device.

Key loggers are often used covertly to monitor activity without the user’s knowledge, which makes them a common instrument in spyware and other malicious surveillance.

While legitimate uses exist, such as debugging, usability testing, or parental‑control applications, most key loggers are associated with unauthorized data collection and privacy violations.

Consequently, deploying or installing a key logger on a system without explicit consent from the owner is generally considered unethical and, in many jurisdictions, illegal.

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