What is the primary function of a keylogger?

A keylogger's primary function is to capture and record keystrokes made on a keyboard. This capability is often exploited by malicious actors to steal personally identifiable information, such as usernames, passwords, and other sensitive data. By monitoring what a user types, keyloggers can gain access to private accounts and confidential information without the user's knowledge.

The other options, while relevant to various aspects of technology and computer operations, do not relate to the core purpose of a keylogger. Enhancing computer speed refers to performance optimization, managing network data pertains to the flow of information within a network, and facilitating data backups involves creating copies of data for recovery purposes. None of these functions align with the keylogger's role in data interception and privacy intrusion.