Cybersecurity integrates aspects of both computer science and social sciences, ranging from economics to psychology to law. To understand cybersecurity, one must have fundamental familiarity with a variety of concepts. These include the "halting problem" which makes it impossible to use a computer to tell whether another system is secure, issues with how new security problems emerge from computer networks, the difference between data and information and which should be the focus of cybersecurity, the science of analyzing computers and networks for malicious software, and the need for security balanced with psychological, economic, and practical impediments that prevent us from realizing secure systems