Firewalls are a software program that monitors the communication on a computer network and/or via the internet and blocks unwanted information from being transmitted on certain channels (port numbers) to the user’s computer.

Firewalls do this similar to the way a person may block certain cable channels from being available to their kids. The communication is still there in the cable but it is not able to get through to the computer or television. Another way to think of it is having multiple doors on your computer that you can lock and unlock. If you leave too many doors open to your computer something or someone unwanted can get in a lot more easily and then cause problems. Firewalls close those doors and make sure that only authorized communication goes on between computers and on the internet.

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