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The main reason why we every computer needs a firewall is that as it is a software or a hardware where hardware is found in routers and software are found in Computer. When you have a firewall installed in your Computer would be protected from unwanted websites and hackers. It monitors the incoming and outgoing networks and block the unwanted and malicious networks to access your PC. So every computer needs to be shielded with a firewall. Get them to always block unauthorized network users. This is the reason why a firewall is necessary software or hardware program.

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โˆ™ 2015-06-23 11:31:28
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โˆ™ 2011-02-09 10:50:02

A firewall (in computer/networking terms) is a software program or hardware device that intercepts communications between your computer and the outside network and does some processing on them to help block malicious connections.

Software programs install on your computer and are somewhat less effective, but can also offer more features. They only protect the computer they are installed on and must be started and functional in order to work.

Hardware firewalls are dedicated devices that sit physically between your computer and the network (internet, etc). They are always on and tend to do a better job because there is no program to start or crash on the PC. However, it's harder for the average user to control what programs can connect out from a hardware firewall.

Firewalls aren't absolutely necessary, but quite recommended. There are thousands of sources on the internet for malicious activity, they'll scan the network you're connected to and try to take your PC over for a variety of reasons (sending spam, etc). Very few internet connections are immune to this, though some ISPs sell modems (cable, dsl, etc) with built-in firewalls.
As the name suggests it is a virtual wall which protects your computer from outside threats from internet like Hackers, Viruses, Trojans, Spywares etc.

to protect your computer against viruses and other stuff like that they are VERY useful

A firewall can be either hardware or software. For most home users the easiest way is the software firewall. It can be installed relatively easily and its purpose is to block the ports of the computer and only allow those programs and users to access the system that the administrator allows. It helps to block unwanted users and programs from running and accessing your computer.

Yes ,If you do not have one Zone Alarm is recommended.

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