A hardware firewall is a physical device that is installed between the computer and the internet connection. It is designed to protect the computer from malicious attacks and unauthorized access. Examples of hardware firewalls include routers, modems, and dedicated firewall appliances.
A software firewall is a program that is installed on the computer and is designed to protect it from malicious attacks and unauthorized access. Examples of software firewalls include Windows Firewall, Norton Internet Security, and McAfee Internet Security.