Software firewalls are widely recommended for single computers.
The software is prepackaged on some operating systems or can be purchased for individual computers.
Jennifer has been fighting her parents, Anne and Charles, for custody of her 6-year-old daughter and claims they are "out to get her".
They say Jennifer is irresponsible and incapable of being a good mother, and she needs help getting her life back on track.
If it detects malicious code, like a virus or a worm, it works to disarm or remove it.
The same advice parents might deliver to young drivers on their first solo journey applies to everyone who wants to navigate safely online.A special agent in our Cyber Division offered the following: A firewall helps protect your computer from hackers who might try to gain access to crash it, delete information, or even steal passwords or other sensitive information.