When you think of security, it's a good bet that some of your thinking drifts to hackers and crackers. These are both security threats that you have to take into account. But do you know the difference? Well, some people do, and although many of them don't want their names bandied about, as is the case with the author of this tip, they can tell us much about the shadowy hacker community, and other security threats as well. This tip defines the difference between hackers and crackers, and discusses some simple things they can do to get inside your systems.