What is a combination of hardware and software that separates a network into two or more parts for security purposes?

A combination of hardware and software that separates a network into two or more parts for security purposes is known as a firewall. Firewalls monitor and control incoming and outgoing network traffic based on predetermined security rules, effectively creating a barrier between trusted internal networks and untrusted external networks. They can be implemented as hardware devices, software applications, or a combination of both to enhance security and manage network access.