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.

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 ...

(1) Any computer in the network. (2) A platform for personal computers introduced in 1996 that never caught on. However, the concept was valid and has subsequently been embodied in Web-based ...