Security is freedom from, or resilience against, potential harm (or other unwanted coercive change) caused by others. Beneficiaries (technically referents) of security may be of persons and social groups, objects and institutions, ecosystems or any other entity or phenomenon vulnerable to unwanted change. The term is also used to refer to acts and systems whose purpose may be to provide security (e.g.: , security forces, security guard, cyber security systems, security cameras, remote guarding). Security is not only physical but it can also be Virtual.