These books are all about hacking - ethical hacking to be precise. Ethical hacking is the art of testing your own network and computers for security holes and learning how to close them up before an unethical hacker gets the chance to get in and do damage. With all the stories in the news on an almost daily basis about hacking, digital security has become one of the most crucial factors in our lives. Most people do their banking online, they use PayPal, they use email and these, plus any other service or website you use with personal information, are open to being hacked.