What is the primary function of keylogger software?

The primary function of keylogger software is to record every keystroke made on a device's keyboard. This capability allows keyloggers to capture sensitive information, such as passwords, personal messages, and other data entered by the user. Keyloggers can be used for legitimate purposes, such as monitoring user activity for parental control or employee monitoring, but they are often associated with malicious intent, as they can enable unauthorized access to confidential information.

The other options do not align with the core functionality of keyloggers. Encryption, network filtering, and sending hoax emails are distinct activities that do not involve recording keystrokes. Encrypting data enhances security, filtering network traffic focuses on controlling data flow, and sending hoax emails relates to social engineering techniques. Understanding the specific purpose of keylogger software is essential for recognizing its role in both ethical and unethical contexts in data security.