Etymology<br />The word 'secure' entered the English language in the 16th century.[1] It is derived from Latin securus, meaning freedom from anxiety: se (without) + cura (care, anxiety).[1]<br /><br />A security referent is the focus of a security policy or discourse; for example, a referent may be a potential beneficiary (or victim) of a security policy or system.<br /><br />Security referents may be persons or social groups, objects, institutions, ecosystems, or any other phenomenon vulnerable to unwanted change by the forces of its environment.[2] The referent in question may combine many referents, in the same way that, for example, a nation state is composed of many individual citizens.[3]<br /><br />Context<br />The security context is the relationships between a security referent and its environment.[2] From this perspective, security and insecurity depend first on whether the environment is beneficial or hostile to the referent, and also how capable is the referent of responding to its/their environment in order to survive and thrive.[3]<br /><br />Capabilities<br />The means by which a referent provides for security (or is provided for) vary widely. They include, for example:<br /><br />Coercive capabilities, including the capacity to project coercive power into the environment (e.g. aircraft carrier, handgun, firearms);<br />Protective systems (e.g. lock, fence, wall, antivirus software, air defence system, armour)<br />Warning systems (e.g. alarm, radar)<br />Diplomatic and social action intended to prevent insecurity from developing (e.g. conflict prevention and transformation strategies); and<br />Policy intended to develop the lasting economic, physical, ecological and other conditions of security (e.g. economic reform, ecological protection, progressive demilitarization, militarization).<br /><br />: Computer security<br />Computer security, also known as cybersecurity or IT security, refers to the security of computing devices such as computers and smartphones, as well as computer networks such as private and public networks, and the Internet. The field has growing importance due to the increasing reliance on computer systems in most societies.[9] It concerns the protection of hardware, software, data, people, and also the procedures by which systems are accessed. The means of computer security include the physical security of systems and security of information held on them.<br /><br />: Corporate security<br />Corporate security refers to the resilience of corporations against espionage, theft, damage, and other threats. The security of corporations has become more complex as reliance on IT systems has increased, and their physical presence has become more highly distributed across several countries, including environments that are, or may rapidly become, hostile to them.<br />Ecological security<br />: Environmental security<br />Ecological security, also known as environmental security, refers to the integrity of ecosystems and the biosphere, particularly in relation to their capacity to sustain a diversity of life-forms (including human life). The security of ecosystems has attracted greater attention as the impact of ecological damage by humans has grown.<br />: Food security<br />Food security refers to the ready supply of, and access to, safe and nutritious food.[11] Food security is gaining in importance as the world's population has grown and productive land has diminished through overuse and climate change<br />