What Is A Firewall? Apr 2026

Firewalls serve three main purposes to keep your digital environment safe:

: Every piece of data sent over the internet is broken into small "packets." The firewall examines each packet's header (source, destination, and port) and drops any that don't meet its rules. What is a Firewall?

: Modern firewalls remember active connections. If a packet arrives claiming to be part of a conversation you never started, the firewall blocks it. Firewalls serve three main purposes to keep your