What is a firewall?
A firewall is a security system that regulates traffic into and out of a network. It can be used to block unauthorized entry from outsiders or to block insiders from accessing unauthorized content.
How does a firewall work?
Firewalls typically block or allow traffic based on the application being used and the device’s range of ports. A firewall can block specific programs or only allow a program to utilize certain ports to connect to the internet.
A firewall can be a security measure or a means of censorship or both, depending on the intention of the administrator.