What type of technology is primarily used for personal firewalls?

Personal firewalls primarily utilize software technology to protect individual computers from network attacks. This software can monitor and control incoming and outgoing network traffic based on predetermined security rules. By doing so, personal firewalls help prevent unauthorized access to, and from, a user's device, thus enhancing the security of the system against threats such as malware, viruses, and hackers.

This software is often characterized by its ability to provide an easy interface for users to customize security settings, enable or disable certain connections, and provide real-time alerts about potential threats. Personal firewalls are essential tools for users, especially those who connect their devices to public or less secure networks, because they help maintain a secure computing environment on personal machines.

The other options describe different concepts. For instance, a hardware device that protects a computer from network attacks refers to network firewalls that operate at the perimeter of a network, rather than on individual machines. On the other hand, servers providing IP addresses or virtual resources pertain to network management and cloud computing functions and do not directly relate to the concept of personal firewalls.