A firewall is a program that blocks certain internet programs and sites from accessing a computer. While a firewall can protect against some online threats, it cannot detect the contents of emails or protect against phishing scams. Firewalls can be either software already installed on a computer or hardware that uses a router and ethernet card to control internet access and filter network traffic.

1. By Cy

2.  A firewall is a program that blocks certain
programs such as sites from the Internet .
Most computers should have a firewall
installed.

3.  A firewall can not find out what is in an e-mail
message so the firewall can not stop it.
 A firewall can also not protect you from a
phishing scam.

4.  Sometimes computers come with a firewall
already installed such as future generation
computers.
 A hardware firewall has a router and a
Ethernet card

5.  Hardware Firewalls are routers that have a
Ethernet card with a hub.
 The Ethernet card and hub allow the user of
the computer to go to Internet sites.

6.  A software firewall has a firewall already
installed.
 You can also buy a firewall that protects you
from hackers.