This document provides an introduction to cyber security. It defines cyber security as protecting computing systems and the data stored or accessed on those systems, including PCs, laptops, smartphones, and mobile devices. Computer security is important as it enables staff to work, decreases vulnerabilities, supports business processes, and protects personal information. While technical security measures protect around 10% of threats, the remaining 90% rely on individual adherence to safeguards like not leaving valuables in plain sight. The document discusses confidentiality, integrity, and availability as principles of cyber security and notes that everyone must understand how to securely use computers and devices. It provides two multiple choice questions to test understanding.