What is a key function of a keystroke logger?

A keystroke logger's primary function is to record all actions typed on a keyboard, making this the most appropriate choice. Keystroke loggers capture every keystroke an individual types, which can be used for various purposes, both legitimate and malicious. For example, in a corporate environment, they might be used to monitor employee activity and ensure productivity. In contrast, cybercriminals may employ keystroke loggers to steal sensitive information, such as passwords and personal data.

The other options do not align with the function of a keystroke logger. Enhancing computer performance pertains to optimizing resources and speed, which is unrelated to the logging of keystrokes. Encrypting data involves converting it into a secure format to protect it from unauthorized access, which is distinct from the recording function of a keystroke logger. Tracking internet browsing history records websites visited, but this too does not encompass the purpose of logging keystrokes. Thus, option B stands out as the accurate description of a keystroke logger's key function.