A keylogger or keystroke logging software is a spying tool often used by hackers to record keystrokes made by users. Hackers use keystroke logging software and hardware keyloggers to record and access victim’s sensitive information such as bank details, account passwords, private keys, etc. for personal gains.

There are three major types of hardware keyloggers:

Hidden camera loggers used to visually monitor keystrokes.
USB-loaded keyloggers that deliver a keystroke logger malware to a computer
Keyboard hardware keyloggers that are either built-in or connected to a device via a cable.

Keyloggers can be used to steal digital currencies from users by recording their private keys from their crypto wallets or logging their exchange passwords. This risk can easily be mitigated by using a hardware wallet and activating the two-factor authentication (2FA) feature in exchange accounts, which most major crypto exchanges support.

Keyloggers also have legitimate use cases. For instance, system administrators may use keylogging software to track employees’ activities. Keyloggers are also useful for law enforcement as they can be used to monitor criminals and send all recorded information to all offices efficiently.

A keylogger is a type of software or hardware device designed to covertly record keystrokes on a computer or mobile device. It captures every keystroke typed by the user, including passwords, sensitive information, and messages, without the user's knowledge. Keyloggers can be used for various purposes, including monitoring employee activity, tracking computer usage, or in malicious activities such as identity theft and unauthorized access to confidential data. While some keyloggers are legitimate tools used for security and parental control, others are used for malicious intent, making it essential for users to protect their devices against potential threats.