Hacking is unauthorized intrusion into a computer or a network. The person engaged in hacking activities is generally referred to as a hacker. This hacker may alter system or security features to accomplish a goal that differs from the original purpose. Ways to Prevent Computer Hacking Educational institutions must clearly establish use policies and delineate appropriate and inappropriate actions to all individuals who access information via a computer. The use of filters or firewalls may be considered to reduce access to unauthorized software serial numbers and other hacking-related materials.