Infosec, or information security, forms a critical part of cyber security because it helps to protect online data from authorized access or use. The three pillars of infosec, Confidentiality, Integrity and Availability, often referred to as the CIA triad, are foundational principles for maintaining a robust level of security. Confidentiality involves checking whether your systems are protected from external, authorized access. Integrity entails ensuring that data has not been tampered with and is correct and trustworthy, while availability involves checking that networks, systems and applications are operational and ready for use when required.