The firewall built into Windows starting with Windows XP Service Pack 2. Windows Firewall provides a stateful inspection of packets that accepts only responses to requests originated by the user. This ...

Software installed in a user's computer that offers protection against unwanted intrusion and attacks coming from the Internet. Personal firewalls are available from numerous security vendors, and ...

Learn how a firewall filters out cyber-threats, while still letting you access everything you want to look at online. When you purchase through links on our site, we may earn an affiliate commission.